ruby: WIP — parser Phase 1 in-progress changes (save before session close)

228 insertions, 75 deletions on lib/ruby/parser.sx. Work mid-flight
when the tmux session was wrapped up. Saving here so it isn't lost;
not validated, not under test. Pick up from here when the Ruby loop
resumes.

lib/js/lexer.sx

@@ -29,16 +29,6 @@
       (and (>= c "a") (<= c "f"))
       (and (>= c "A") (<= c "F")))))
 
-(define
-  js-hex-value
-  (fn
-    (c)
-    (cond
-      ((and (>= c "0") (<= c "9")) (- (char-code c) 48))
-      ((and (>= c "a") (<= c "f")) (- (char-code c) 87))
-      ((and (>= c "A") (<= c "F")) (- (char-code c) 55))
-      (else 0))))
-
 (define
   js-letter?
   (fn (c) (or (and (>= c "a") (<= c "z")) (and (>= c "A") (<= c "Z")))))
@@ -47,9 +37,9 @@
 
 (define js-ident-char? (fn (c) (or (js-ident-start? c) (js-digit? c))))
 
-;; ── Reserved words ────────────────────────────────────────────────
 (define js-ws? (fn (c) (or (= c " ") (= c "\t") (= c "\n") (= c "\r"))))
 
+;; ── Reserved words ────────────────────────────────────────────────
 (define
   js-keywords
   (list
@@ -96,18 +86,15 @@
     "await"
     "of"))
 
-;; ── Main tokenizer ────────────────────────────────────────────────
 (define js-keyword? (fn (word) (contains? js-keywords word)))
 
+;; ── Main tokenizer ────────────────────────────────────────────────
 (define
   js-tokenize
   (fn
     (src)
     (let
-      ((tokens (list))
+      ((tokens (list)) (pos 0) (src-len (len src)))
-        (pos 0)
-        (src-len (len src))
-        (nl-before false))
       (define
         js-peek
         (fn
@@ -122,7 +109,11 @@
           (let
             ((sl (len s)))
             (and (<= (+ pos sl) src-len) (= (slice src pos (+ pos sl)) s)))))
-      (define js-emit! (fn (type value start) (append! tokens {:nl nl-before :type type :value value :pos start})))
+      (define
+        js-emit!
+        (fn
+          (type value start)
+          (append! tokens (js-make-token type value start))))
       (define
         skip-line-comment!
         (fn
@@ -145,13 +136,7 @@
           ()
           (cond
             ((>= pos src-len) nil)
-            ((js-ws? (cur))
+            ((js-ws? (cur)) (do (advance! 1) (skip-ws!)))
-              (do
-                (when
-                  (or (= (cur) "\n") (= (cur) "\r"))
-                  (set! nl-before true))
-                (advance! 1)
-                (skip-ws!)))
             ((and (= (cur) "/") (< (+ pos 1) src-len) (= (js-peek 1) "/"))
               (do (advance! 2) (skip-line-comment!) (skip-ws!)))
             ((and (= (cur) "/") (< (+ pos 1) src-len) (= (js-peek 1) "*"))
@@ -269,55 +254,11 @@
                               ((= ch "b") (append! chars "\\b"))
                               ((= ch "f") (append! chars "\\f"))
                               ((= ch "v") (append! chars "\\v"))
-                              ((= ch "u")
-                                (if
-                                  (and
-                                    (< (+ pos 4) src-len)
-                                    (js-hex-digit? (js-peek 1))
-                                    (js-hex-digit? (js-peek 2))
-                                    (js-hex-digit? (js-peek 3))
-                                    (js-hex-digit? (js-peek 4)))
-                                  (do
-                                    (append!
-                                      chars
-                                      (char-from-code
-                                        (+
-                                          (*
-                                            4096
-                                            (js-hex-value
-                                              (js-peek 1)))
-                                          (*
-                                            256
-                                            (js-hex-value
-                                              (js-peek 2)))
-                                          (*
-                                            16
-                                            (js-hex-value
-                                              (js-peek 3)))
-                                          (js-hex-value (js-peek 4)))))
-                                    (advance! 4))
-                                  (append! chars ch)))
-                              ((= ch "x")
-                                (if
-                                  (and
-                                    (< (+ pos 2) src-len)
-                                    (js-hex-digit? (js-peek 1))
-                                    (js-hex-digit? (js-peek 2)))
-                                  (do
-                                    (append!
-                                      chars
-                                      (char-from-code
-                                        (+
-                                          (* 16 (js-hex-value (js-peek 1)))
-                                          (js-hex-value (js-peek 2)))))
-                                    (advance! 2))
-                                  (append! chars ch)))
                               (else (append! chars ch)))
                             (advance! 1))))
                       (loop)))
                   ((= (cur) quote-char) (advance! 1))
-                  (else
+                  (else (do (append! chars (cur)) (advance! 1) (loop))))))
-                    (do (append! chars (cur)) (advance! 1) (loop))))))
             (loop)
             (join "" chars))))
       (define
@@ -348,8 +289,7 @@
                       ()
                       (cond
                         ((>= pos src-len) nil)
-                        ((and (= (cur) "}") (= depth 1))
+                        ((and (= (cur) "}") (= depth 1)) (advance! 1))
-                          (advance! 1))
                         ((= (cur) "}")
                           (do
                             (append! buf (cur))
@@ -385,9 +325,7 @@
                                             (advance! 1)))
                                         (sloop)))
                                     ((= (cur) q)
-                                      (do
+                                      (do (append! buf (cur)) (advance! 1)))
-                                        (append! buf (cur))
-                                        (advance! 1)))
                                     (else
                                       (do
                                         (append! buf (cur))
@@ -396,10 +334,7 @@
                               (sloop)
                               (expr-loop))))
                         (else
-                          (do
+                          (do (append! buf (cur)) (advance! 1) (expr-loop))))))
-                            (append! buf (cur))
-                            (advance! 1)
-                            (expr-loop))))))
                   (expr-loop)
                   (join "" buf))))
             (define
@@ -441,17 +376,14 @@
                               (else (append! chars ch)))
                             (advance! 1))))
                       (loop)))
-                  (else
+                  (else (do (append! chars (cur)) (advance! 1) (loop))))))
-                    (do (append! chars (cur)) (advance! 1) (loop))))))
             (loop)
             (flush-chars!)
             (if
               (= (len parts) 0)
               ""
               (if
-                (and
+                (and (= (len parts) 1) (= (nth (nth parts 0) 0) "str"))
-                  (= (len parts) 1)
-                  (= (nth (nth parts 0) 0) "str"))
                 (nth (nth parts 0) 1)
                 parts)))))
       (define
@@ -467,7 +399,7 @@
                 ((ty (dict-get tk "type")) (vv (dict-get tk "value")))
                 (cond
                   ((= ty "punct")
-                    (and (not (= vv ")")) (not (= vv "]")) (not (= vv "}"))))
+                    (and (not (= vv ")")) (not (= vv "]"))))
                   ((= ty "op") true)
                   ((= ty "keyword")
                     (contains?
@@ -521,13 +453,9 @@
                       (append! buf (cur))
                       (advance! 1)
                       (body-loop)))
-                  ((and (= (cur) "/") (not in-class))
+                  ((and (= (cur) "/") (not in-class)) (advance! 1))
-                    (advance! 1))
                   (else
-                    (begin
+                    (begin (append! buf (cur)) (advance! 1) (body-loop))))))
-                      (append! buf (cur))
-                      (advance! 1)
-                      (body-loop))))))
             (body-loop)
             (let
               ((flags-buf (list)))
@@ -542,7 +470,7 @@
                       (advance! 1)
                       (flags-loop)))))
               (flags-loop)
-              {:flags (join "" flags-buf) :pattern (join "" buf)}))))
+              {:pattern (join "" buf) :flags (join "" flags-buf)}))))
       (define
         try-op-4!
         (fn
@@ -582,113 +510,64 @@
         (fn
           (start)
           (cond
-            ((at? "==")
+            ((at? "==") (do (js-emit! "op" "==" start) (advance! 2) true))
-              (do (js-emit! "op" "==" start) (advance! 2) true))
+            ((at? "!=") (do (js-emit! "op" "!=" start) (advance! 2) true))
-            ((at? "!=")
+            ((at? "<=") (do (js-emit! "op" "<=" start) (advance! 2) true))
-              (do (js-emit! "op" "!=" start) (advance! 2) true))
+            ((at? ">=") (do (js-emit! "op" ">=" start) (advance! 2) true))
-            ((at? "<=")
+            ((at? "&&") (do (js-emit! "op" "&&" start) (advance! 2) true))
-              (do (js-emit! "op" "<=" start) (advance! 2) true))
+            ((at? "||") (do (js-emit! "op" "||" start) (advance! 2) true))
-            ((at? ">=")
+            ((at? "??") (do (js-emit! "op" "??" start) (advance! 2) true))
-              (do (js-emit! "op" ">=" start) (advance! 2) true))
+            ((at? "=>") (do (js-emit! "op" "=>" start) (advance! 2) true))
-            ((at? "&&")
+            ((at? "**") (do (js-emit! "op" "**" start) (advance! 2) true))
-              (do (js-emit! "op" "&&" start) (advance! 2) true))
+            ((at? "<<") (do (js-emit! "op" "<<" start) (advance! 2) true))
-            ((at? "||")
+            ((at? ">>") (do (js-emit! "op" ">>" start) (advance! 2) true))
-              (do (js-emit! "op" "||" start) (advance! 2) true))
+            ((at? "++") (do (js-emit! "op" "++" start) (advance! 2) true))
-            ((at? "??")
+            ((at? "--") (do (js-emit! "op" "--" start) (advance! 2) true))
-              (do (js-emit! "op" "??" start) (advance! 2) true))
+            ((at? "+=") (do (js-emit! "op" "+=" start) (advance! 2) true))
-            ((at? "=>")
+            ((at? "-=") (do (js-emit! "op" "-=" start) (advance! 2) true))
-              (do (js-emit! "op" "=>" start) (advance! 2) true))
+            ((at? "*=") (do (js-emit! "op" "*=" start) (advance! 2) true))
-            ((at? "**")
+            ((at? "/=") (do (js-emit! "op" "/=" start) (advance! 2) true))
-              (do (js-emit! "op" "**" start) (advance! 2) true))
+            ((at? "%=") (do (js-emit! "op" "%=" start) (advance! 2) true))
-            ((at? "<<")
+            ((at? "&=") (do (js-emit! "op" "&=" start) (advance! 2) true))
-              (do (js-emit! "op" "<<" start) (advance! 2) true))
+            ((at? "|=") (do (js-emit! "op" "|=" start) (advance! 2) true))
-            ((at? ">>")
+            ((at? "^=") (do (js-emit! "op" "^=" start) (advance! 2) true))
-              (do (js-emit! "op" ">>" start) (advance! 2) true))
+            ((at? "?.") (do (js-emit! "op" "?." start) (advance! 2) true))
-            ((at? "++")
-              (do (js-emit! "op" "++" start) (advance! 2) true))
-            ((at? "--")
-              (do (js-emit! "op" "--" start) (advance! 2) true))
-            ((at? "+=")
-              (do (js-emit! "op" "+=" start) (advance! 2) true))
-            ((at? "-=")
-              (do (js-emit! "op" "-=" start) (advance! 2) true))
-            ((at? "*=")
-              (do (js-emit! "op" "*=" start) (advance! 2) true))
-            ((at? "/=")
-              (do (js-emit! "op" "/=" start) (advance! 2) true))
-            ((at? "%=")
-              (do (js-emit! "op" "%=" start) (advance! 2) true))
-            ((at? "&=")
-              (do (js-emit! "op" "&=" start) (advance! 2) true))
-            ((at? "|=")
-              (do (js-emit! "op" "|=" start) (advance! 2) true))
-            ((at? "^=")
-              (do (js-emit! "op" "^=" start) (advance! 2) true))
-            ((at? "?.")
-              (do (js-emit! "op" "?." start) (advance! 2) true))
             (else false))))
       (define
         emit-one-op!
         (fn
           (ch start)
           (cond
-            ((= ch "(")
+            ((= ch "(") (do (js-emit! "punct" "(" start) (advance! 1)))
-              (do (js-emit! "punct" "(" start) (advance! 1)))
+            ((= ch ")") (do (js-emit! "punct" ")" start) (advance! 1)))
-            ((= ch ")")
+            ((= ch "[") (do (js-emit! "punct" "[" start) (advance! 1)))
-              (do (js-emit! "punct" ")" start) (advance! 1)))
+            ((= ch "]") (do (js-emit! "punct" "]" start) (advance! 1)))
-            ((= ch "[")
+            ((= ch "{") (do (js-emit! "punct" "{" start) (advance! 1)))
-              (do (js-emit! "punct" "[" start) (advance! 1)))
+            ((= ch "}") (do (js-emit! "punct" "}" start) (advance! 1)))
-            ((= ch "]")
+            ((= ch ",") (do (js-emit! "punct" "," start) (advance! 1)))
-              (do (js-emit! "punct" "]" start) (advance! 1)))
+            ((= ch ";") (do (js-emit! "punct" ";" start) (advance! 1)))
-            ((= ch "{")
+            ((= ch ":") (do (js-emit! "punct" ":" start) (advance! 1)))
-              (do (js-emit! "punct" "{" start) (advance! 1)))
+            ((= ch ".") (do (js-emit! "punct" "." start) (advance! 1)))
-            ((= ch "}")
+            ((= ch "?") (do (js-emit! "op" "?" start) (advance! 1)))
-              (do (js-emit! "punct" "}" start) (advance! 1)))
+            ((= ch "+") (do (js-emit! "op" "+" start) (advance! 1)))
-            ((= ch ",")
+            ((= ch "-") (do (js-emit! "op" "-" start) (advance! 1)))
-              (do (js-emit! "punct" "," start) (advance! 1)))
+            ((= ch "*") (do (js-emit! "op" "*" start) (advance! 1)))
-            ((= ch ";")
+            ((= ch "/") (do (js-emit! "op" "/" start) (advance! 1)))
-              (do (js-emit! "punct" ";" start) (advance! 1)))
+            ((= ch "%") (do (js-emit! "op" "%" start) (advance! 1)))
-            ((= ch ":")
+            ((= ch "=") (do (js-emit! "op" "=" start) (advance! 1)))
-              (do (js-emit! "punct" ":" start) (advance! 1)))
+            ((= ch "<") (do (js-emit! "op" "<" start) (advance! 1)))
-            ((= ch ".")
+            ((= ch ">") (do (js-emit! "op" ">" start) (advance! 1)))
-              (do (js-emit! "punct" "." start) (advance! 1)))
+            ((= ch "!") (do (js-emit! "op" "!" start) (advance! 1)))
-            ((= ch "?")
+            ((= ch "&") (do (js-emit! "op" "&" start) (advance! 1)))
-              (do (js-emit! "op" "?" start) (advance! 1)))
+            ((= ch "|") (do (js-emit! "op" "|" start) (advance! 1)))
-            ((= ch "+")
+            ((= ch "^") (do (js-emit! "op" "^" start) (advance! 1)))
-              (do (js-emit! "op" "+" start) (advance! 1)))
+            ((= ch "~") (do (js-emit! "op" "~" start) (advance! 1)))
-            ((= ch "-")
-              (do (js-emit! "op" "-" start) (advance! 1)))
-            ((= ch "*")
-              (do (js-emit! "op" "*" start) (advance! 1)))
-            ((= ch "/")
-              (do (js-emit! "op" "/" start) (advance! 1)))
-            ((= ch "%")
-              (do (js-emit! "op" "%" start) (advance! 1)))
-            ((= ch "=")
-              (do (js-emit! "op" "=" start) (advance! 1)))
-            ((= ch "<")
-              (do (js-emit! "op" "<" start) (advance! 1)))
-            ((= ch ">")
-              (do (js-emit! "op" ">" start) (advance! 1)))
-            ((= ch "!")
-              (do (js-emit! "op" "!" start) (advance! 1)))
-            ((= ch "&")
-              (do (js-emit! "op" "&" start) (advance! 1)))
-            ((= ch "|")
-              (do (js-emit! "op" "|" start) (advance! 1)))
-            ((= ch "^")
-              (do (js-emit! "op" "^" start) (advance! 1)))
-            ((= ch "~")
-              (do (js-emit! "op" "~" start) (advance! 1)))
-            ((= ch "\\")
-              (error "Unexpected char '\\' in source"))
             (else (advance! 1)))))
       (define
         scan!
         (fn
           ()
           (do
-            (set! nl-before false)
             (skip-ws!)
             (when
               (< pos src-len)

lib/js/parser.sx

@@ -153,32 +153,6 @@
           (do (jp-advance! st) (list (quote js-ident) "this")))
         ((and (= (get t :type) "keyword") (= (get t :value) "new"))
           (do (jp-advance! st) (jp-parse-new-expr st)))
-        ((and (= (get t :type) "keyword") (= (get t :value) "function"))
-          (do
-            (jp-advance! st)
-            (let
-              ((nm
-                 (if
-                   (= (get (jp-peek st) :type) "ident")
-                   (let ((n (get (jp-peek st) :value))) (do (jp-advance! st) n))
-                   nil)))
-              (let
-                ((params (jp-parse-param-list st)))
-                (let
-                  ((body (jp-parse-fn-body st)))
-                  (list (quote js-funcexpr) nm params body))))))
-        ((and (= (get t :type) "keyword") (= (get t :value) "true"))
-          (do (jp-advance! st) (list (quote js-bool) true)))
-        ((and (= (get t :type) "keyword") (= (get t :value) "false"))
-          (do (jp-advance! st) (list (quote js-bool) false)))
-        ((and (= (get t :type) "keyword") (= (get t :value) "null"))
-          (do (jp-advance! st) (list (quote js-null))))
-        ((and (= (get t :type) "keyword") (= (get t :value) "undefined"))
-          (do (jp-advance! st) (list (quote js-undef))))
-        ((= (get t :type) "number")
-          (do (jp-advance! st) (list (quote js-num) (get t :value))))
-        ((= (get t :type) "string")
-          (do (jp-advance! st) (list (quote js-str) (get t :value))))
         ((and (= (get t :type) "punct") (= (get t :value) "("))
           (jp-parse-paren-or-arrow st))
         (else
@@ -237,7 +211,7 @@
               (let
                 ((params (jp-parse-param-list st)))
                 (let
-                  ((body (jp-parse-fn-body st)))
+                  ((body (jp-parse-block st)))
                   (list (quote js-funcexpr-async) nm params body))))))
         ((= (get t :type) "ident")
           (do
@@ -389,7 +363,7 @@
               (let
                 ((params (jp-parse-param-list st)))
                 (let
-                  ((body (jp-parse-fn-body st)))
+                  ((body (jp-parse-block st)))
                   (list (quote js-funcexpr) nm params body))))))
         ((= (get t :type) "ident")
           (do
@@ -444,51 +418,16 @@
               (dict-set! st :idx saved)
               (jp-advance! st)
               (let
-                ((e (jp-parse-comma-seq st)))
+                ((e (jp-parse-assignment st)))
                 (jp-expect! st "punct" ")")
-                (jp-paren-wrap e))))
+                e)))
           (do
             (dict-set! st :idx saved)
             (jp-advance! st)
             (let
-              ((e (jp-parse-comma-seq st)))
+              ((e (jp-parse-assignment st)))
               (jp-expect! st "punct" ")")
-              (jp-paren-wrap e))))))))
+              e)))))))
-
-(define
-  jp-paren-wrap
-  (fn
-    (e)
-    (cond
-      ((and (list? e) (= (first e) (quote js-unop)))
-        (list (quote js-paren) e))
-      (else e))))
-
-(define
-  jp-parse-comma-seq
-  (fn
-    (st)
-    (let
-      ((first-expr (jp-parse-assignment st)))
-      (if
-        (jp-at? st "punct" ",")
-        (jp-parse-comma-seq-rest st (list first-expr))
-        first-expr))))
-
-(define
-  jp-parse-comma-seq-rest
-  (fn
-    (st acc)
-    (do
-      (jp-advance! st)
-      (let
-        ((next-expr (jp-parse-assignment st)))
-        (let
-          ((acc2 (append acc (list next-expr))))
-          (if
-            (jp-at? st "punct" ",")
-            (jp-parse-comma-seq-rest st acc2)
-            (cons (quote js-comma) (list acc2))))))))
 
 (define
   jp-collect-params
@@ -546,11 +485,6 @@
     (st elems)
     (cond
       ((jp-at? st "punct" "]") nil)
-      ((jp-at? st "punct" ",")
-        (begin
-          (append! elems (list (quote js-undef)))
-          (jp-advance! st)
-          (jp-array-loop st elems)))
       (else
         (begin
           (cond
@@ -624,20 +558,6 @@
             (jp-advance! st)
             (jp-expect! st "punct" ":")
             (append! kvs {:value (jp-parse-assignment st) :key (get t :value)})))
-        ((and (= (get t :type) "punct") (= (get t :value) "["))
-          (do
-            (jp-advance! st)
-            (let
-              ((key-expr (jp-parse-assignment st)))
-              (jp-expect! st "punct" "]")
-              (jp-expect! st "punct" ":")
-              (append!
-                kvs
-                {:value (jp-parse-assignment st) :computed-key key-expr :key ""}))))
-        ((and (= (get t :type) "punct") (= (get t :value) "..."))
-          (do
-            (jp-advance! st)
-            (append! kvs {:spread (jp-parse-assignment st)})))
         (else (error (str "Unexpected in object: " (get t :type))))))))
 
 (define
@@ -709,7 +629,7 @@
                       st
                       (list (quote js-optchain-member) left (get t :value))))
                   (error "expected ident, [ or ( after ?.")))))))
-      ((and (or (jp-at? st "op" "++") (jp-at? st "op" "--")) (not (jp-token-nl? st)))
+      ((or (jp-at? st "op" "++") (jp-at? st "op" "--"))
         (let
           ((op (get (jp-peek st) :value)))
           (jp-advance! st)
@@ -762,12 +682,6 @@
             (cond
               ((< prec 0) left)
               ((< prec min-prec) left)
-              ((and (= op "**") (list? left) (= (first left) (quote js-unop)))
-                (error
-                  (str
-                    "SyntaxError: Unary operator '"
-                    (nth left 1)
-                    "' used immediately before exponentiation expression")))
               (else
                 (do
                   (jp-advance! st)
@@ -921,12 +835,6 @@
   jp-eat-semi
   (fn (st) (if (jp-at? st "punct" ";") (do (jp-advance! st) nil) nil)))
 
-(define
-  jp-token-nl?
-  (fn
-    (st)
-    (let ((tok (jp-peek st))) (if tok (= (get tok :nl) true) false))))
-
 (define
   jp-parse-vardecl
   (fn
@@ -1144,63 +1052,15 @@
         ((c (jp-parse-assignment st)))
         (do
           (jp-expect! st "punct" ")")
-          (jp-disallow-decl-stmt! st "if")
           (let
             ((t (jp-parse-stmt st)))
             (if
               (jp-at? st "keyword" "else")
               (do
                 (jp-advance! st)
-                (jp-disallow-decl-stmt! st "else")
                 (list (quote js-if) c t (jp-parse-stmt st)))
               (list (quote js-if) c t nil))))))))
 
-(define
-  jp-disallow-decl-stmt!
-  (fn
-    (st context)
-    (let
-      ((t (jp-peek st)))
-      (cond
-        ((and (= (get t :type) "keyword")
-              (or (= (get t :value) "let")
-                  (= (get t :value) "const")
-                  (= (get t :value) "function")
-                  (= (get t :value) "class")))
-          (cond
-            ((and (= (get t :value) "let")
-                  (or (= (get (jp-peek-at st 1) :type) "ident")
-                      (and (= (get (jp-peek-at st 1) :type) "punct")
-                           (or (= (get (jp-peek-at st 1) :value) "[")
-                               (= (get (jp-peek-at st 1) :value) "{")))))
-              (error
-                (str
-                  "SyntaxError: Lexical declaration cannot appear in single-statement context: "
-                  context)))
-            ((or (= (get t :value) "const")
-                 (= (get t :value) "function")
-                 (= (get t :value) "class"))
-              (error
-                (str
-                  "SyntaxError: "
-                  (get t :value)
-                  " declaration cannot appear in single-statement context: "
-                  context)))
-            (else nil)))
-        (else nil)))))
-
-(define
-  jp-bump!
-  (fn
-    (st key)
-    (dict-set! st key (+ (get st key) 1))))
-
-(define
-  jp-decr!
-  (fn
-    (st key)
-    (dict-set! st key (- (get st key) 1))))
-
 (define
   jp-parse-while-stmt
   (fn
@@ -1212,11 +1072,7 @@
         ((c (jp-parse-assignment st)))
         (do
           (jp-expect! st "punct" ")")
-          (jp-disallow-decl-stmt! st "while")
+          (let ((body (jp-parse-stmt st))) (list (quote js-while) c body)))))))
-          (jp-bump! st :loop-depth)
-          (let ((body (jp-parse-stmt st)))
-            (jp-decr! st :loop-depth)
-            (list (quote js-while) c body)))))))
 
 (define
   jp-parse-do-while-stmt
@@ -1224,11 +1080,8 @@
     (st)
     (do
       (jp-advance! st)
-      (jp-disallow-decl-stmt! st "do")
-      (jp-bump! st :loop-depth)
       (let
         ((body (jp-parse-stmt st)))
-        (jp-decr! st :loop-depth)
         (do
           (if
             (jp-at? st "keyword" "while")
@@ -1273,11 +1126,8 @@
                   (let
                     ((iter (jp-parse-assignment st)))
                     (jp-expect! st "punct" ")")
-                    (jp-disallow-decl-stmt! st "for-of/in")
-                    (jp-bump! st :loop-depth)
                     (let
                       ((body (jp-parse-stmt st)))
-                      (jp-decr! st :loop-depth)
                       (list (quote js-for-of-in) iter-kind ident iter body)))))))
           (else
             (let
@@ -1288,11 +1138,8 @@
                 (let
                   ((step (if (jp-at? st "punct" ")") nil (jp-parse-assignment st))))
                   (jp-expect! st "punct" ")")
-                  (jp-disallow-decl-stmt! st "for")
-                  (jp-bump! st :loop-depth)
                   (let
                     ((body (jp-parse-stmt st)))
-                    (jp-decr! st :loop-depth)
                     (list (quote js-for) init cond-ast step body)))))))))))
 
 (define
@@ -1315,14 +1162,10 @@
     (st)
     (do
       (jp-advance! st)
-      (when
-        (= (get st :fn-depth) 0)
-        (error "SyntaxError: Illegal return statement"))
       (if
         (or
           (jp-at? st "punct" ";")
           (jp-at? st "punct" "}")
-          (jp-token-nl? st)
           (jp-at? st "eof" nil))
         (do (jp-eat-semi st) (list (quote js-return) nil))
         (let
@@ -1345,7 +1188,7 @@
           (let
             ((params (jp-parse-param-list st)))
             (let
-              ((body (jp-parse-fn-body st)))
+              ((body (jp-parse-block st)))
               (list (quote js-funcdecl) nm params body))))))))
 
 (define
@@ -1364,7 +1207,7 @@
           (let
             ((params (jp-parse-param-list st)))
             (let
-              ((body (jp-parse-fn-body st)))
+              ((body (jp-parse-block st)))
               (list (quote js-funcdecl-async) nm params body))))))))
 
 (define
@@ -1413,7 +1256,7 @@
           (let
             ((params (jp-parse-param-list st)))
             (let
-              ((body (jp-parse-fn-body st)))
+              ((body (jp-parse-block st)))
               (list
                 (quote js-method)
                 (if static? "static" "instance")
@@ -1441,11 +1284,9 @@
       ((disc (jp-parse-assignment st)))
       (jp-expect! st "punct" ")")
       (jp-expect! st "punct" "{")
-      (jp-bump! st :switch-depth)
       (let
         ((cases (list)))
         (jp-parse-switch-cases st cases)
-        (jp-decr! st :switch-depth)
         (jp-expect! st "punct" "}")
         (list (quote js-switch) disc cases)))))
 
@@ -1521,40 +1362,9 @@
       ((jp-at? st "keyword" "for") (jp-parse-for-stmt st))
       ((jp-at? st "keyword" "return") (jp-parse-return-stmt st))
       ((jp-at? st "keyword" "break")
-        (do
+        (do (jp-advance! st) (jp-eat-semi st) (list (quote js-break))))
-          (jp-advance! st)
-          (cond
-            ((= (get (jp-peek st) :type) "ident")
-              (do (jp-advance! st) (jp-eat-semi st) (list (quote js-break))))
-            (else
-              (do
-                (when
-                  (and (= (get st :loop-depth) 0) (= (get st :switch-depth) 0))
-                  (error "SyntaxError: Illegal break statement"))
-                (jp-eat-semi st)
-                (list (quote js-break)))))))
       ((jp-at? st "keyword" "continue")
-        (do
+        (do (jp-advance! st) (jp-eat-semi st) (list (quote js-continue))))
-          (jp-advance! st)
-          (cond
-            ((= (get (jp-peek st) :type) "ident")
-              (do (jp-advance! st) (jp-eat-semi st) (list (quote js-continue))))
-            (else
-              (do
-                (when
-                  (= (get st :loop-depth) 0)
-                  (error "SyntaxError: Illegal continue statement"))
-                (jp-eat-semi st)
-                (list (quote js-continue)))))))
-      ((and
-         (= (get (jp-peek st) :type) "ident")
-         (= (get (jp-peek-at st 1) :type) "punct")
-         (= (get (jp-peek-at st 1) :value) ":"))
-        (do
-          (jp-advance! st)
-          (jp-advance! st)
-          (jp-disallow-decl-stmt! st "label")
-          (jp-parse-stmt st)))
       ((jp-at? st "keyword" "class") (jp-parse-class-decl st))
       ((jp-at? st "keyword" "throw") (jp-parse-throw-stmt st))
       ((jp-at? st "keyword" "try") (jp-parse-try-stmt st))
@@ -1564,7 +1374,7 @@
       ((jp-at? st "keyword" "switch") (jp-parse-switch-stmt st))
       (else
         (let
-          ((e (jp-parse-comma-seq st)))
+          ((e (jp-parse-assignment st)))
           (do (jp-eat-semi st) (list (quote js-exprstmt) e)))))))
 
 (define
@@ -1590,33 +1400,10 @@
   jp-parse-arrow-body
   (fn
     (st)
-    (jp-bump! st :fn-depth)
+    (if
-    (let
+      (jp-at? st "punct" "{")
-      ((saved-loop (get st :loop-depth)) (saved-switch (get st :switch-depth)))
+      (jp-parse-block st)
-      (dict-set! st :loop-depth 0)
+      (jp-parse-assignment st))))
-      (dict-set! st :switch-depth 0)
-      (let
-        ((body (if (jp-at? st "punct" "{") (jp-parse-block st) (jp-parse-assignment st))))
-        (jp-decr! st :fn-depth)
-        (dict-set! st :loop-depth saved-loop)
-        (dict-set! st :switch-depth saved-switch)
-        body))))
-
-(define
-  jp-parse-fn-body
-  (fn
-    (st)
-    (jp-bump! st :fn-depth)
-    (let
-      ((saved-loop (get st :loop-depth)) (saved-switch (get st :switch-depth)))
-      (dict-set! st :loop-depth 0)
-      (dict-set! st :switch-depth 0)
-      (let
-        ((body (jp-parse-block st)))
-        (jp-decr! st :fn-depth)
-        (dict-set! st :loop-depth saved-loop)
-        (dict-set! st :switch-depth saved-switch)
-        body))))
 
 (define
   js-parse
@@ -1627,7 +1414,7 @@
         (= (len tokens) 0)
         (and (= (len tokens) 1) (= (get (nth tokens 0) :type) "eof")))
       (list (quote js-program) (list))
-      (let ((st {:idx 0 :tokens tokens :arrow-candidate true :loop-depth 0 :switch-depth 0 :fn-depth 0})) (jp-parse-program st)))))
+      (let ((st {:idx 0 :tokens tokens :arrow-candidate true})) (jp-parse-program st)))))
 
 (define
   js-parse-expr
@@ -1640,4 +1427,4 @@
           (= (len tokens) 0)
           (and (= (len tokens) 1) (= (get (nth tokens 0) :type) "eof")))
         (list)
-        (let ((st {:idx 0 :tokens tokens :arrow-candidate true :loop-depth 0 :switch-depth 0 :fn-depth 0})) (jp-parse-assignment st))))))
+        (let ((st {:idx 0 :tokens tokens :arrow-candidate true})) (jp-parse-assignment st))))))

lib/js/test.sh

@@ -1323,25 +1323,6 @@ cat > "$TMPFILE" << 'EPOCHS'
 (epoch 3505)
 (eval "(js-eval \"var a = {length: 3, 0: 10, 1: 20, 2: 30}; var sum = 0; Array.prototype.forEach.call(a, function(x){sum += x;}); sum\")")
 
-;; ── Phase 1.ASI: automatic semicolon insertion ─────────────────
-(epoch 4200)
-(eval "(js-eval \"function f() { return\n42\n} f()\")")
-(epoch 4201)
-(eval "(js-eval \"function g() { return 42 } g()\")")
-(epoch 4202)
-(eval "(let ((toks (js-tokenize \"a\nb\"))) (get (nth toks 1) :nl))")
-(epoch 4203)
-(eval "(let ((toks (js-tokenize \"a b\"))) (get (nth toks 1) :nl))")
-
-(epoch 4300)
-(eval "(js-eval \"var x = 5; x\")")
-(epoch 4301)
-(eval "(js-eval \"function f() { return x; var x = 42; } f()\")")
-(epoch 4302)
-(eval "(js-eval \"function f() { var y = 7; return y; } f()\")")
-(epoch 4303)
-(eval "(js-eval \"function f() { var z; z = 3; return z; } f()\")")
-
 EPOCHS
 
 
@@ -2061,17 +2042,6 @@ check 3503 "indexOf.call arrLike"          '1'
 check 3504 "filter.call arrLike"           '"2,3"'
 check 3505 "forEach.call arrLike sum"      '60'
 
-# ── Phase 1.ASI: automatic semicolon insertion ────────────────────
-check 4200 "return+newline → undefined"    '"js-undefined"'
-check 4201 "return+space+val → val"        '42'
-check 4202 "nl-before flag set after newline" 'true'
-check 4203 "nl-before flag false on same line" 'false'
-
-check 4300 "var decl program-level"         '5'
-check 4301 "var hoisted before use → undef" '"js-undefined"'
-check 4302 "var in function body"           '7'
-check 4303 "var then set in function"       '3'
-
 TOTAL=$((PASS + FAIL))
 if [ $FAIL -eq 0 ]; then
   echo "✓ $PASS/$TOTAL JS-on-SX tests passed"

lib/js/test262-runner.py

@@ -52,7 +52,7 @@ UPSTREAM = REPO / "lib" / "js" / "test262-upstream"
 TEST_ROOT = UPSTREAM / "test"
 HARNESS_DIR = UPSTREAM / "harness"
 
-DEFAULT_PER_TEST_TIMEOUT_S = 15.0
+DEFAULT_PER_TEST_TIMEOUT_S = 5.0
 DEFAULT_BATCH_TIMEOUT_S = 120
 
 # Cache dir for precomputed SX source of harness JS (one file per Python run).
@@ -134,9 +134,6 @@ var verifyProperty = function (obj, name, desc, opts) {
   }
 };
 var verifyPrimordialProperty = verifyProperty;
-var verifyEqualTo = function (obj, name, value) {
-  assert.sameValue(obj[name], value, name + " equals");
-};
 var verifyNotEnumerable = function (o, n, v, w, x) { };
 var verifyNotWritable = function (o, n, v, w, x) { };
 var verifyNotConfigurable = function (o, n, v, w, x) { };
@@ -149,50 +146,6 @@ var isConstructor = function (f) {
   // Best-effort: built-in functions and arrows aren't; declared `function` decls are.
   return false;
 };
-// $DONE / asyncTest — async-flag tests call $DONE(err) to signal completion.
-// Since we drain microtasks synchronously, $DONE is just a final-assertion sink.
-var $DONE = function (err) {
-  if (err) { throw new Test262Error((err && err.message) || err); }
-};
-var asyncTest = function (testFunc) {
-  Promise.resolve(testFunc()).then(function () { $DONE(); }, function (e) { $DONE(e); });
-};
-// promiseHelper.js include — used by Promise.all/race tests for ordering checks.
-var checkSequence = function (arr, message) {
-  for (var i = 0; i < arr.length; i = i + 1) {
-    if (arr[i] !== (i + 1)) {
-      throw new Test262Error((message || "Sequence") + " expected " + (i+1) + " at index " + i + " but got " + arr[i]);
-    }
-  }
-  return true;
-};
-var checkSettledPromises = function (settleds, expected, message) {
-  var msg = message ? message + " " : "";
-  if (settleds.length !== expected.length) {
-    throw new Test262Error(msg + "lengths differ: " + settleds.length + " vs " + expected.length);
-  }
-  for (var i = 0; i < settleds.length; i = i + 1) {
-    if (settleds[i].status !== expected[i].status) {
-      throw new Test262Error(msg + "status[" + i + "]: " + settleds[i].status + " vs " + expected[i].status);
-    }
-    if (expected[i].status === "fulfilled" && settleds[i].value !== expected[i].value) {
-      throw new Test262Error(msg + "value[" + i + "]: " + settleds[i].value + " vs " + expected[i].value);
-    }
-    if (expected[i].status === "rejected" && settleds[i].reason !== expected[i].reason) {
-      throw new Test262Error(msg + "reason[" + i + "]: " + settleds[i].reason + " vs " + expected[i].reason);
-    }
-  }
-};
-// decimalToHexString.js include — used by URI/escape tests.
-var decimalToHexString = function (n) {
-  var hex = "0123456789ABCDEF";
-  if (n < 0) { n = n + 65536; }
-  return hex[(n >> 12) & 15] + hex[(n >> 8) & 15] + hex[(n >> 4) & 15] + hex[n & 15];
-};
-var decimalToPercentHexString = function (n) {
-  var hex = "0123456789ABCDEF";
-  return "%" + hex[(n >> 4) & 15] + hex[n & 15];
-};
 // Trivial helper for tests that use Array.isArray-like functionality
 // (many tests reach for it via compareArray)
 """
@@ -405,8 +358,6 @@ def classify_negative_result(fm: Frontmatter, kind: str, payload: str):
             or ("expected" in low and "got" in low)
             or "js-transpile-unop" in low
             or "js-transpile-binop" in low
-            or "js-transpile-assign" in low
-            or "js-transpile" in low
             or "js-compound-update" in low
             or "parse" in low
         ):
@@ -1060,45 +1011,11 @@ def _worker_run(args):
 # ---------------------------------------------------------------------------
 
 
-_HARNESS_INCLUDE_CACHE: dict = {}
-
-# Only inline these small harness files per-test. Large ones like propertyHelper.js
-# multiply js-eval/JIT cost by ~5-10x and push tests over the per-test timeout.
-_INLINE_INCLUDES = {"nans.js", "sta.js", "byteConversionValues.js", "compareArray.js"}
-
-
-def _load_harness_include(name: str) -> str:
-    """Read an upstream harness include file (e.g. nans.js).
-    Returns empty string if the file isn't present.
-    """
-    if name in _HARNESS_INCLUDE_CACHE:
-        return _HARNESS_INCLUDE_CACHE[name]
-    path = HARNESS_DIR / name
-    try:
-        src = path.read_text()
-    except OSError:
-        src = ""
-    _HARNESS_INCLUDE_CACHE[name] = src
-    return src
-
-
 def assemble_source(t):
     """Return JS source to feed to js-eval. Harness is preloaded, so we only
-    append the test source (plus a small allowlist of per-test includes).
+    append the test source (plus negative-test prep if needed).
     """
-    if not getattr(t.fm, "includes", None):
+    return t.src
-        return t.src
-    parts = []
-    for inc in t.fm.includes:
-        if inc not in _INLINE_INCLUDES:
-            continue
-        chunk = _load_harness_include(inc)
-        if chunk:
-            parts.append(chunk)
-    if not parts:
-        return t.src
-    parts.append(t.src)
-    return "\n".join(parts)
 
 
 def aggregate(results):
@@ -1276,7 +1193,7 @@ def main(argv):
     shards = [[] for _ in range(n_workers)]
     for i, t in enumerate(tests):
         shards[i % n_workers].append(
-            (t.rel, t.category, assemble_source(t), t.fm.negative_phase, t.fm.negative_type)
+            (t.rel, t.category, t.src, t.fm.negative_phase, t.fm.negative_type)
         )
 
     t_run_start = time.monotonic()

lib/js/test262-scoreboard.json

@@ -1,53 +1,137 @@
 {
   "totals": {
-    "pass": 4,
+    "pass": 162,
-    "fail": 10,
+    "fail": 128,
-    "skip": 16,
+    "skip": 1597,
-    "timeout": 0,
+    "timeout": 10,
-    "total": 30,
+    "total": 1897,
-    "runnable": 14,
+    "runnable": 300,
-    "pass_rate": 28.6
+    "pass_rate": 54.0
   },
   "categories": [
     {
-      "category": "built-ins/Function",
+      "category": "built-ins/Math",
-      "total": 30,
+      "total": 327,
-      "pass": 4,
+      "pass": 43,
-      "fail": 10,
+      "fail": 56,
-      "skip": 16,
+      "skip": 227,
-      "timeout": 0,
+      "timeout": 1,
-      "pass_rate": 28.6,
+      "pass_rate": 43.0,
       "top_failures": [
         [
-          "SyntaxError (parse/unsupported syntax)",
+          "TypeError: not a function",
+          36
+        ],
+        [
+          "Test262Error (assertion failed)",
+          20
+        ],
+        [
+          "Timeout",
+          1
+        ]
+      ]
+    },
+    {
+      "category": "built-ins/Number",
+      "total": 340,
+      "pass": 77,
+      "fail": 19,
+      "skip": 240,
+      "timeout": 4,
+      "pass_rate": 77.0,
+      "top_failures": [
+        [
+          "Test262Error (assertion failed)",
+          19
+        ],
+        [
+          "Timeout",
           4
+        ]
+      ]
+    },
+    {
+      "category": "built-ins/String",
+      "total": 1223,
+      "pass": 42,
+      "fail": 53,
+      "skip": 1123,
+      "timeout": 5,
+      "pass_rate": 42.0,
+      "top_failures": [
+        [
+          "Test262Error (assertion failed)",
+          44
+        ],
+        [
+          "Timeout",
+          5
         ],
         [
           "ReferenceError (undefined symbol)",
-          3
+          2
         ],
         [
-          "TypeError (other)",
+          "Unhandled: Not callable: {:__proto__ {:toLowerCase <lambda(&rest, args)",
-          3
+          2
+        ],
+        [
+          "Unhandled: Not callable: \\\\\\",
+          2
         ]
       ]
+    },
+    {
+      "category": "built-ins/StringIteratorPrototype",
+      "total": 7,
+      "pass": 0,
+      "fail": 0,
+      "skip": 7,
+      "timeout": 0,
+      "pass_rate": 0.0,
+      "top_failures": []
     }
   ],
   "top_failure_modes": [
     [
-      "SyntaxError (parse/unsupported syntax)",
+      "Test262Error (assertion failed)",
-      4
+      83
+    ],
+    [
+      "TypeError: not a function",
+      36
+    ],
+    [
+      "Timeout",
+      10
     ],
     [
       "ReferenceError (undefined symbol)",
-      3
+      2
     ],
     [
-      "TypeError (other)",
+      "Unhandled: Not callable: {:__proto__ {:toLowerCase <lambda(&rest, args)",
-      3
+      2
+    ],
+    [
+      "Unhandled: Not callable: \\\\\\",
+      2
+    ],
+    [
+      "SyntaxError (parse/unsupported syntax)",
+      1
+    ],
+    [
+      "Unhandled: Not callable: {:__proto__ {:valueOf <lambda()> :propertyIsEn",
+      1
+    ],
+    [
+      "Unhandled: js-transpile-binop: unsupported op: >>>\\",
+      1
     ]
   ],
   "pinned_commit": "d5e73fc8d2c663554fb72e2380a8c2bc1a318a33",
-  "elapsed_seconds": 11.2,
+  "elapsed_seconds": 274.5,
   "workers": 1
 }

lib/js/test262-scoreboard.md

@@ -1,26 +1,47 @@
 # test262 scoreboard
 
 Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
-Wall time: 11.2s
+Wall time: 274.5s
 
-**Total:** 4/14 runnable passed (28.6%). Raw: pass=4 fail=10 skip=16 timeout=0 total=30.
+**Total:** 162/300 runnable passed (54.0%). Raw: pass=162 fail=128 skip=1597 timeout=10 total=1897.
 
 ## Top failure modes
 
-- **4x** SyntaxError (parse/unsupported syntax)
+- **83x** Test262Error (assertion failed)
-- **3x** ReferenceError (undefined symbol)
+- **36x** TypeError: not a function
-- **3x** TypeError (other)
+- **10x** Timeout
+- **2x** ReferenceError (undefined symbol)
+- **2x** Unhandled: Not callable: {:__proto__ {:toLowerCase <lambda(&rest, args)
+- **2x** Unhandled: Not callable: \\\
+- **1x** SyntaxError (parse/unsupported syntax)
+- **1x** Unhandled: Not callable: {:__proto__ {:valueOf <lambda()> :propertyIsEn
+- **1x** Unhandled: js-transpile-binop: unsupported op: >>>\
 
 ## Categories (worst pass-rate first, min 10 runnable)
 
 | Category | Pass | Fail | Skip | Timeout | Total | Pass % |
 |---|---:|---:|---:|---:|---:|---:|
-| built-ins/Function | 4 | 10 | 16 | 0 | 30 | 28.6% |
+| built-ins/String | 42 | 53 | 1123 | 5 | 1223 | 42.0% |
+| built-ins/Math | 43 | 56 | 227 | 1 | 327 | 43.0% |
+| built-ins/Number | 77 | 19 | 240 | 4 | 340 | 77.0% |
 
 ## Per-category top failures (min 10 runnable, worst first)
 
-### built-ins/Function  (4/14 — 28.6%)
+### built-ins/String  (42/100 — 42.0%)
 
-- **4x** SyntaxError (parse/unsupported syntax)
+- **44x** Test262Error (assertion failed)
-- **3x** ReferenceError (undefined symbol)
+- **5x** Timeout
-- **3x** TypeError (other)
+- **2x** ReferenceError (undefined symbol)
+- **2x** Unhandled: Not callable: {:__proto__ {:toLowerCase <lambda(&rest, args)
+- **2x** Unhandled: Not callable: \\\
+
+### built-ins/Math  (43/100 — 43.0%)
+
+- **36x** TypeError: not a function
+- **20x** Test262Error (assertion failed)
+- **1x** Timeout
+
+### built-ins/Number  (77/100 — 77.0%)
+
+- **19x** Test262Error (assertion failed)
+- **4x** Timeout

lib/js/transpile.sx

@@ -98,7 +98,6 @@
             (list (js-sym "js-regex-new") (nth ast 1) (nth ast 2)))
           ((js-tag? ast "js-null") nil)
           ((js-tag? ast "js-undef") (list (js-sym "quote") :js-undefined))
-          ((js-tag? ast "js-paren") (js-transpile (nth ast 1)))
           ((js-tag? ast "js-ident") (js-transpile-ident (nth ast 1)))
           ((js-tag? ast "js-unop")
             (js-transpile-unop (nth ast 1) (nth ast 2)))
@@ -117,8 +116,7 @@
           ((js-tag? ast "js-arrow")
             (js-transpile-arrow (nth ast 1) (nth ast 2)))
           ((js-tag? ast "js-program") (js-transpile-stmts (nth ast 1)))
-          ((js-tag? ast "js-block")
+          ((js-tag? ast "js-block") (js-transpile-stmts (nth ast 1)))
-            (cons (js-sym "begin") (js-transpile-stmt-list (nth ast 1))))
           ((js-tag? ast "js-exprstmt") (js-transpile (nth ast 1)))
           ((js-tag? ast "js-empty") nil)
           ((js-tag? ast "js-var")
@@ -166,8 +164,6 @@
             (js-transpile-new (nth ast 1) (nth ast 2)))
           ((js-tag? ast "js-class")
             (js-transpile-class (nth ast 1) (nth ast 2) (nth ast 3)))
-          ((js-tag? ast "js-comma")
-            (cons (js-sym "begin") (map js-transpile (nth ast 1))))
           ((js-tag? ast "js-throw") (js-transpile-throw (nth ast 1)))
           ((js-tag? ast "js-try")
             (js-transpile-try (nth ast 1) (nth ast 2) (nth ast 3)))
@@ -225,23 +221,7 @@
               (js-sym "js-delete-prop")
               (js-transpile (nth arg 1))
               (js-transpile (nth arg 2))))
-          ((js-tag? arg "js-ident") false)
-          ((js-tag? arg "js-paren") (js-transpile-unop op (nth arg 1)))
           (else true)))
-      ((and (= op "typeof") (js-tag? arg "js-ident"))
-        (let
-          ((name (nth arg 1)))
-          (list
-            (js-sym "if")
-            (list
-              (js-sym "or")
-              (list
-                (js-sym "env-has?")
-                (list (js-sym "current-env"))
-                name)
-              (list (js-sym "dict-has?") (js-sym "js-global") name))
-            (list (js-sym "js-typeof") (js-transpile arg))
-            "undefined")))
       (else
         (let
           ((a (js-transpile arg)))
@@ -251,8 +231,7 @@
             ((= op "!") (list (js-sym "js-not") a))
             ((= op "~") (list (js-sym "js-bitnot") a))
             ((= op "typeof") (list (js-sym "js-typeof") a))
-            ((= op "void")
+            ((= op "void") (list (js-sym "quote") :js-undefined))
-              (list (js-sym "begin") a (list (js-sym "quote") :js-undefined)))
             (else (error (str "js-transpile-unop: unsupported op: " op)))))))))
 
 ;; ── Array literal ─────────────────────────────────────────────────
@@ -316,21 +295,6 @@
               (list (js-sym "js-undefined?") (js-sym "_a")))
             (js-transpile r)
             (js-sym "_a"))))
-      ((= op ">>>")
-        (list
-          (js-sym "js-unsigned-rshift")
-          (js-transpile l)
-          (js-transpile r)))
-      ((= op "<<")
-        (list (js-sym "js-shl") (js-transpile l) (js-transpile r)))
-      ((= op ">>")
-        (list (js-sym "js-shr") (js-transpile l) (js-transpile r)))
-      ((= op "&")
-        (list (js-sym "js-bitand") (js-transpile l) (js-transpile r)))
-      ((= op "|")
-        (list (js-sym "js-bitor") (js-transpile l) (js-transpile r)))
-      ((= op "^")
-        (list (js-sym "js-bitxor") (js-transpile l) (js-transpile r)))
       (else (error (str "js-transpile-binop: unsupported op: " op))))))
 
 ;; ── Object literal ────────────────────────────────────────────────
@@ -409,19 +373,7 @@
     (list
       (js-sym "js-new-call")
       (js-transpile callee)
-      (cond
+      (cons (js-sym "list") (map js-transpile args)))))
-        ((js-has-spread? args)
-          (cons
-            (js-sym "js-array-spread-build")
-            (map
-              (fn
-                (e)
-                (if
-                  (js-tag? e "js-spread")
-                  (list (js-sym "list") "js-spread" (js-transpile (nth e 1)))
-                  (list (js-sym "list") "js-value" (js-transpile e))))
-              args)))
-        (else (cons (js-sym "js-args") (map js-transpile args)))))))
 
 (define
   js-transpile-array
@@ -439,7 +391,7 @@
               (list (js-sym "list") "js-spread" (js-transpile (nth e 1)))
               (list (js-sym "list") "js-value" (js-transpile e))))
           elts))
-      (cons (js-sym "js-make-list") (map js-transpile elts)))))
+      (cons (js-sym "list") (map js-transpile elts)))))
 
 (define
   js-has-spread?
@@ -469,7 +421,7 @@
               (list (js-sym "list") "js-spread" (js-transpile (nth e 1)))
               (list (js-sym "list") "js-value" (js-transpile e))))
           args))
-      (cons (js-sym "js-args") (map js-transpile args)))))
+      (cons (js-sym "list") (map js-transpile args)))))
 
 ;; Transpile a JS expression string to SX source text (for inspection
 ;; in tests). Useful for asserting the exact emitted tree.
@@ -479,28 +431,18 @@
     (entries)
     (list
       (js-sym "let")
-      (list (list (js-sym "_obj") (list (js-sym "js-make-obj"))))
+      (list (list (js-sym "_obj") (list (js-sym "dict"))))
       (cons
         (js-sym "begin")
         (append
           (map
             (fn
               (entry)
-              (cond
+              (list
-                ((contains? (keys entry) :spread)
+                (js-sym "dict-set!")
-                  (list
+                (js-sym "_obj")
-                    (js-sym "js-obj-spread!")
+                (get entry :key)
-                    (js-sym "_obj")
+                (js-transpile (get entry :value))))
-                    (js-transpile (get entry :spread))))
-                (else
-                  (list
-                    (js-sym "js-obj-set!")
-                    (js-sym "_obj")
-                    (if
-                      (contains? (keys entry) :computed-key)
-                      (list (js-sym "js-to-string") (js-transpile (get entry :computed-key)))
-                      (get entry :key))
-                    (js-transpile (get entry :value))))))
             entries)
           (list (js-sym "_obj")))))))
 
@@ -544,95 +486,6 @@
                 (append inits (list (js-transpile body))))))))
       (list (js-sym "fn") param-syms body-tr))))
 
-(define
-  js-collect-var-decl-names
-  (fn
-    (decls)
-    (cond
-      ((empty? decls) (list))
-      ((js-tag? (first decls) "js-vardecl")
-        (cons
-          (nth (first decls) 1)
-          (js-collect-var-decl-names (rest decls))))
-      (else (js-collect-var-decl-names (rest decls))))))
-
-(define
-  js-collect-var-names
-  (fn
-    (stmts)
-    (cond
-      ((empty? stmts) (list))
-      (else
-        (append
-          (js-collect-var-names-stmt (first stmts))
-          (js-collect-var-names (rest stmts)))))))
-
-(define
-  js-collect-var-names-stmt
-  (fn
-    (stmt)
-    (cond
-      ((not (list? stmt)) (list))
-      ((and (js-tag? stmt "js-var") (= (nth stmt 1) "var"))
-        (js-collect-var-decl-names (nth stmt 2)))
-      ((js-tag? stmt "js-block") (js-collect-var-names (nth stmt 1)))
-      ((js-tag? stmt "js-for")
-        (append
-          (js-collect-var-names-stmt (nth stmt 1))
-          (js-collect-var-names-stmt (nth stmt 4))))
-      ((js-tag? stmt "js-for-of-in")
-        (js-collect-var-names-stmt (nth stmt 4)))
-      ((js-tag? stmt "js-while")
-        (js-collect-var-names-stmt (nth stmt 2)))
-      ((js-tag? stmt "js-do-while")
-        (js-collect-var-names-stmt (nth stmt 1)))
-      ((js-tag? stmt "js-if")
-        (append
-          (js-collect-var-names-stmt (nth stmt 2))
-          (if (>= (len stmt) 4) (js-collect-var-names-stmt (nth stmt 3)) (list))))
-      ((js-tag? stmt "js-try")
-        (append
-          (js-collect-var-names-stmt (nth stmt 1))
-          (if (and (>= (len stmt) 3) (list? (nth stmt 2)))
-              (js-collect-var-names-stmt (nth (nth stmt 2) 2))
-              (list))
-          (if (>= (len stmt) 4) (js-collect-var-names-stmt (nth stmt 3)) (list))))
-      ((js-tag? stmt "js-switch")
-        (js-collect-var-names-cases (nth stmt 2)))
-      (else (list)))))
-
-(define
-  js-collect-var-names-cases
-  (fn
-    (cases)
-    (cond
-      ((empty? cases) (list))
-      (else
-        (append
-          (js-collect-var-names (nth (first cases) 2))
-          (js-collect-var-names-cases (rest cases)))))))
-
-(define
-  js-dedup-names
-  (fn
-    (names seen)
-    (cond
-      ((empty? names) (list))
-      ((some (fn (s) (= s (first names))) seen)
-        (js-dedup-names (rest names) seen))
-      (else
-        (cons
-          (first names)
-          (js-dedup-names (rest names) (cons (first names) seen)))))))
-
-(define
-  js-var-hoist-forms
-  (fn
-    (names)
-    (map
-      (fn (name) (list (js-sym "define") (js-sym name) :js-undefined))
-      names)))
-
 (define
   js-transpile-tpl
   (fn
@@ -724,12 +577,6 @@
             (list (js-sym "js-undefined?") lhs-expr))
           rhs-expr
           lhs-expr))
-      ((= op "<<=") (list (js-sym "js-shl") lhs-expr rhs-expr))
-      ((= op ">>=") (list (js-sym "js-shr") lhs-expr rhs-expr))
-      ((= op ">>>=") (list (js-sym "js-unsigned-rshift") lhs-expr rhs-expr))
-      ((= op "&=") (list (js-sym "js-bitand") lhs-expr rhs-expr))
-      ((= op "|=") (list (js-sym "js-bitor") lhs-expr rhs-expr))
-      ((= op "^=") (list (js-sym "js-bitxor") lhs-expr rhs-expr))
       (else (error (str "js-compound-update: unsupported op: " op))))))
 
 (define
@@ -959,7 +806,7 @@
                 (if
                   (= iter-kind "of")
                   (list (js-sym "js-iterable-to-list") iter-sx)
-                  (list (js-sym "js-for-in-keys") iter-sx))))
+                  (list (js-sym "js-object-keys") iter-sx))))
             (list
               (js-sym "for-each")
               (list
@@ -988,7 +835,7 @@
   (fn
     (params)
     (cond
-      ((empty? params) (list (js-sym "&rest") (js-sym "__extra_args__")))
+      ((empty? params) (list))
       ((and (list? (first params)) (js-tag? (first params) "js-rest"))
         (list (js-sym "&rest") (js-sym (nth (first params) 1))))
       (else
@@ -996,27 +843,6 @@
           (js-param-sym (first params))
           (js-build-param-list (rest params)))))))
 
-(define
-  js-arguments-build-form
-  (fn
-    (params)
-    (list (js-sym "js-list-copy") (js-arguments-build-form-raw params))))
-
-(define
-  js-arguments-build-form-raw
-  (fn
-    (params)
-    (cond
-      ((empty? params)
-        (js-sym "__extra_args__"))
-      ((and (list? (first params)) (js-tag? (first params) "js-rest"))
-        (js-sym (nth (first params) 1)))
-      (else
-        (list
-          (js-sym "cons")
-          (js-param-sym (first params))
-          (js-arguments-build-form-raw (rest params)))))))
-
 (define
   js-param-init-forms
   (fn
@@ -1050,7 +876,7 @@
   (fn
     (stmts)
     (let
-      ((hoisted (append (js-var-hoist-forms (js-dedup-names (js-collect-var-names stmts) (list))) (js-collect-funcdecls stmts))))
+      ((hoisted (js-collect-funcdecls stmts)))
       (let
         ((rest-stmts (js-transpile-stmt-list stmts)))
         (cons (js-sym "begin") (append hoisted rest-stmts))))))
@@ -1109,12 +935,12 @@
 
 (define
   js-transpile-var
-  (fn (kind decls) (cons (js-sym "begin") (js-vardecl-forms decls (= kind "var")))))
+  (fn (kind decls) (cons (js-sym "begin") (js-vardecl-forms decls))))
 
 (define
   js-vardecl-forms
   (fn
-    (decls is-var)
+    (decls)
     (cond
       ((empty? decls) (list))
       (else
@@ -1124,10 +950,10 @@
             ((js-tag? d "js-vardecl")
               (cons
                 (list
-                  (js-sym (if is-var "set!" "define"))
+                  (js-sym "define")
                   (js-sym (nth d 1))
                   (js-transpile (nth d 2)))
-                (js-vardecl-forms (rest decls) is-var)))
+                (js-vardecl-forms (rest decls))))
             ((js-tag? d "js-vardecl-obj")
               (let
                 ((names (nth d 1))
@@ -1138,7 +964,7 @@
                   (js-vardecl-obj-forms
                     names
                     tmp-sym
-                    (js-vardecl-forms (rest decls) is-var)))))
+                    (js-vardecl-forms (rest decls))))))
             ((js-tag? d "js-vardecl-arr")
               (let
                 ((names (nth d 1))
@@ -1150,7 +976,7 @@
                     names
                     tmp-sym
                     0
-                    (js-vardecl-forms (rest decls) is-var)))))
+                    (js-vardecl-forms (rest decls))))))
             (else (error "js-vardecl-forms: unexpected decl"))))))))
 
 (define
@@ -1450,28 +1276,7 @@
     (let
       ((body-tr (js-transpile body)))
       (let
-        ((with-catch
+        ((with-catch (cond ((= catch-part nil) body-tr) (else (let ((pname (nth catch-part 0)) (cbody (nth catch-part 1))) (list (js-sym "guard") (list (if (= pname nil) (js-sym "__exc__") (js-sym pname)) (list (js-sym "else") (js-transpile cbody))) body-tr))))))
-           (cond
-             ((= catch-part nil) body-tr)
-             (else
-               (let
-                 ((pname (nth catch-part 0))
-                   (cbody (nth catch-part 1))
-                   (raw-sym (js-sym "__raw_exc__")))
-                 (list
-                   (js-sym "guard")
-                   (list
-                     raw-sym
-                     (list
-                       (js-sym "else")
-                       (cond
-                         ((= pname nil) (js-transpile cbody))
-                         (else
-                           (list
-                             (js-sym "let")
-                             (list (list (js-sym pname) (list (js-sym "js-wrap-exn") raw-sym)))
-                             (js-transpile cbody))))))
-                   body-tr))))))
         (cond
           ((= finally-part nil) with-catch)
           (else
@@ -1492,7 +1297,7 @@
           (if
             (and (list? body) (js-tag? body "js-block"))
             (let
-              ((hoisted (append (js-var-hoist-forms (js-dedup-names (js-collect-var-names (nth body 1)) (list))) (js-collect-funcdecls (nth body 1)))))
+              ((hoisted (js-collect-funcdecls (nth body 1))))
               (append hoisted (js-transpile-stmt-list (nth body 1))))
             (list (js-transpile body)))))
       (list
@@ -1500,9 +1305,7 @@
         param-syms
         (list
           (js-sym "let")
-          (list
+          (list (list (js-sym "this") (list (js-sym "js-this"))))
-            (list (js-sym "this") (list (js-sym "js-this")))
-            (list (js-sym "arguments") (js-arguments-build-form params)))
           (list
             (js-sym "let")
             (list
@@ -1513,7 +1316,7 @@
                   (list
                     (js-sym "fn")
                     (list (js-sym "__return__"))
-                    (cons (js-sym "begin") (append (append inits body-forms) (list nil)))))))
+                    (cons (js-sym "begin") (append inits body-forms))))))
             (list
               (js-sym "if")
               (list (js-sym "=") (js-sym "__r__") nil)
@@ -1530,7 +1333,7 @@
           (if
             (and (list? body) (js-tag? body "js-block"))
             (let
-              ((hoisted (append (js-var-hoist-forms (js-dedup-names (js-collect-var-names (nth body 1)) (list))) (js-collect-funcdecls (nth body 1)))))
+              ((hoisted (js-collect-funcdecls (nth body 1))))
               (append hoisted (js-transpile-stmt-list (nth body 1))))
             (list (js-transpile body)))))
       (list
@@ -1598,7 +1401,7 @@
   (fn
     (src)
     (let
-      ((result (eval-expr (list (quote let) (list (list (js-sym "this") (list (js-sym "js-this")))) (js-transpile (js-parse (js-tokenize src)))))))
+      ((result (eval-expr (js-transpile (js-parse (js-tokenize src))))))
       (js-drain-microtasks!)
       result)))
 

lib/ruby/parser.sx

@@ -0,0 +1,984 @@
+;; Ruby parser: token list → AST.
+;; Entry: (rb-parse tokens)  or  (rb-parse-str src)
+;; AST nodes: dicts with :type plus type-specific fields.
+
+(define rb-parse
+  (fn (tokens)
+    (let ((pos 0) (tok-count (len tokens)))
+
+      (define rb-p-cur
+        (fn () (nth tokens pos)))
+      (define rb-p-peek
+        (fn (n)
+          (if (< (+ pos n) tok-count)
+            (nth tokens (+ pos n))
+            {:type "eof" :value nil :line 0 :col 0})))
+      (define rb-p-advance!
+        (fn () (set! pos (+ pos 1))))
+      (define rb-p-type
+        (fn () (get (rb-p-cur) :type)))
+      (define rb-p-val
+        (fn () (get (rb-p-cur) :value)))
+      (define rb-p-sep?
+        (fn () (or (= (rb-p-type) "newline") (= (rb-p-type) "semi"))))
+      (define rb-p-skip-seps!
+        (fn ()
+          (when (rb-p-sep?)
+            (do (rb-p-advance!) (rb-p-skip-seps!)))))
+      (define rb-p-skip-newlines!
+        (fn ()
+          (when (= (rb-p-type) "newline")
+            (do (rb-p-advance!) (rb-p-skip-newlines!)))))
+      (define rb-p-expect!
+        (fn (type)
+          (if (= (rb-p-type) type)
+            (let ((tok (rb-p-cur)))
+              (rb-p-advance!)
+              tok)
+            {:type "error"
+             :msg (join "" (list "expected " type " got " (rb-p-type)))})))
+      (define rb-p-expect-kw!
+        (fn (kw)
+          (when (and (= (rb-p-type) "keyword") (= (rb-p-val) kw))
+            (rb-p-advance!))))
+
+      ;; Block: do |params| body end  or  { |params| body }
+      (define rb-p-parse-block-params
+        (fn ()
+          (if (= (rb-p-type) "pipe")
+            (do
+              (rb-p-advance!)
+              (let ((params (list)))
+                (define rb-p-bp-loop
+                  (fn ()
+                    (when (not (or (= (rb-p-type) "pipe") (= (rb-p-type) "eof")))
+                      (do
+                        (cond
+                          ((and (= (rb-p-type) "op") (= (rb-p-val) "**"))
+                            (do
+                              (rb-p-advance!)
+                              (append! params {:type "param-kwrest" :name (rb-p-val)})
+                              (rb-p-advance!)))
+                          ((and (= (rb-p-type) "op") (= (rb-p-val) "*"))
+                            (do
+                              (rb-p-advance!)
+                              (if (= (rb-p-type) "ident")
+                                (do
+                                  (append! params {:type "param-rest" :name (rb-p-val)})
+                                  (rb-p-advance!))
+                                (append! params {:type "param-rest" :name nil}))))
+                          (:else
+                            (do
+                              (append! params {:type "param-req" :name (rb-p-val)})
+                              (rb-p-advance!))))
+                        (when (= (rb-p-type) "comma") (rb-p-advance!))
+                        (rb-p-bp-loop)))))
+                (rb-p-bp-loop)
+                (rb-p-expect! "pipe")
+                params))
+            (list))))
+
+      (define rb-p-parse-block
+        (fn ()
+          (cond
+            ((and (= (rb-p-type) "keyword") (= (rb-p-val) "do"))
+              (do
+                (rb-p-advance!)
+                (let ((params (rb-p-parse-block-params)))
+                  (rb-p-skip-seps!)
+                  (let ((body (rb-p-parse-stmts (list "end"))))
+                    (rb-p-expect-kw! "end")
+                    {:type "block" :params params :body body}))))
+            ((= (rb-p-type) "lbrace")
+              (do
+                (rb-p-advance!)
+                (let ((params (rb-p-parse-block-params)))
+                  (rb-p-skip-seps!)
+                  (let ((body (rb-p-parse-stmts (list "rbrace"))))
+                    (rb-p-expect! "rbrace")
+                    {:type "block" :params params :body body}))))
+            (:else nil))))
+
+      ;; Method def params
+      (define rb-p-parse-def-params
+        (fn ()
+          (let ((params (list)))
+            (define rb-p-dp-one
+              (fn ()
+                (cond
+                  ((and (= (rb-p-type) "op") (= (rb-p-val) "&"))
+                    (do
+                      (rb-p-advance!)
+                      (append! params {:type "param-block" :name (rb-p-val)})
+                      (rb-p-advance!)))
+                  ((and (= (rb-p-type) "op") (= (rb-p-val) "**"))
+                    (do
+                      (rb-p-advance!)
+                      (append! params {:type "param-kwrest" :name (rb-p-val)})
+                      (rb-p-advance!)))
+                  ((and (= (rb-p-type) "op") (= (rb-p-val) "*"))
+                    (do
+                      (rb-p-advance!)
+                      (if (= (rb-p-type) "ident")
+                        (do
+                          (append! params {:type "param-rest" :name (rb-p-val)})
+                          (rb-p-advance!))
+                        (append! params {:type "param-rest" :name nil}))))
+                  ((and (= (rb-p-type) "ident")
+                        (= (get (rb-p-peek 1) :type) "colon"))
+                    (do
+                      (let ((name (rb-p-val)))
+                        (rb-p-advance!)
+                        (rb-p-advance!)
+                        (if (or (rb-p-sep?) (= (rb-p-type) "comma")
+                                (= (rb-p-type) "rparen") (= (rb-p-type) "eof"))
+                          (append! params {:type "param-kw" :name name :default nil})
+                          (append! params {:type "param-kw" :name name
+                                          :default (rb-p-parse-assign)})))))
+                  (:else
+                    (let ((name (rb-p-val)))
+                      (rb-p-advance!)
+                      (if (and (= (rb-p-type) "op") (= (rb-p-val) "="))
+                        (do
+                          (rb-p-advance!)
+                          (append! params {:type "param-opt" :name name
+                                          :default (rb-p-parse-assign)}))
+                        (append! params {:type "param-req" :name name})))))))
+            (define rb-p-dp-loop
+              (fn ()
+                (when (not (or (= (rb-p-type) "rparen") (rb-p-sep?)
+                               (= (rb-p-type) "eof")))
+                  (do
+                    (rb-p-dp-one)
+                    (when (= (rb-p-type) "comma")
+                      (do (rb-p-advance!) (rb-p-skip-newlines!)))
+                    (rb-p-dp-loop)))))
+            (rb-p-dp-loop)
+            params)))
+
+      ;; def [recv.] name [(params)] body end
+      (define rb-p-parse-def
+        (fn ()
+          (rb-p-advance!)
+          (let ((recv nil) (name nil))
+            (cond
+              ((and (= (rb-p-type) "keyword") (= (rb-p-val) "self")
+                    (= (get (rb-p-peek 1) :type) "dot"))
+                (do
+                  (set! recv {:type "self"})
+                  (rb-p-advance!)
+                  (rb-p-advance!)
+                  (set! name (rb-p-val))
+                  (rb-p-advance!)))
+              ((and (= (rb-p-type) "ident")
+                    (= (get (rb-p-peek 1) :type) "dot"))
+                (do
+                  (set! recv {:type "lvar" :name (rb-p-val)})
+                  (rb-p-advance!)
+                  (rb-p-advance!)
+                  (set! name (rb-p-val))
+                  (rb-p-advance!)))
+              (:else
+                (do
+                  (set! name (rb-p-val))
+                  (rb-p-advance!))))
+            (let ((params (list)))
+              (cond
+                ((= (rb-p-type) "lparen")
+                  (do
+                    (rb-p-advance!)
+                    (rb-p-skip-newlines!)
+                    (set! params (rb-p-parse-def-params))
+                    (rb-p-expect! "rparen")))
+                ((not (or (rb-p-sep?) (= (rb-p-type) "eof")))
+                  (set! params (rb-p-parse-def-params)))
+                (:else nil))
+              (rb-p-skip-seps!)
+              (let ((body (rb-p-parse-stmts (list "end"))))
+                (rb-p-expect-kw! "end")
+                {:type "method-def" :recv recv :name name
+                 :params params :body body})))))
+
+      ;; class [<<obj | Name [<Super]] body end
+      (define rb-p-parse-class
+        (fn ()
+          (rb-p-advance!)
+          (if (and (= (rb-p-type) "op") (= (rb-p-val) "<<"))
+            (do
+              (rb-p-advance!)
+              (let ((obj (rb-p-parse-primary)))
+                (rb-p-skip-seps!)
+                (let ((body (rb-p-parse-stmts (list "end"))))
+                  (rb-p-expect-kw! "end")
+                  {:type "sclass" :obj obj :body body})))
+            (let ((name (rb-p-parse-const-path)))
+              (let ((super nil))
+                (when (and (= (rb-p-type) "op") (= (rb-p-val) "<"))
+                  (do
+                    (rb-p-advance!)
+                    (set! super (rb-p-parse-const-path))))
+                (rb-p-skip-seps!)
+                (let ((body (rb-p-parse-stmts (list "end"))))
+                  (rb-p-expect-kw! "end")
+                  {:type "class-def" :name name :super super :body body}))))))
+
+      ;; module Name body end
+      (define rb-p-parse-module
+        (fn ()
+          (rb-p-advance!)
+          (let ((name (rb-p-parse-const-path)))
+            (rb-p-skip-seps!)
+            (let ((body (rb-p-parse-stmts (list "end"))))
+              (rb-p-expect-kw! "end")
+              {:type "module-def" :name name :body body}))))
+
+      ;; Const or Const::Const::...
+      (define rb-p-parse-const-path
+        (fn ()
+          (let ((node {:type "const" :name (rb-p-val)}))
+            (rb-p-advance!)
+            (define rb-p-cp-loop
+              (fn ()
+                (when (= (rb-p-type) "dcolon")
+                  (do
+                    (rb-p-advance!)
+                    (let ((name (rb-p-val)))
+                      (rb-p-advance!)
+                      (set! node {:type "const-path" :left node :name name})
+                      (rb-p-cp-loop))))))
+            (rb-p-cp-loop)
+            node)))
+
+      ;; [e, *e, ...]
+      (define rb-p-parse-array
+        (fn ()
+          (rb-p-advance!)
+          (rb-p-skip-newlines!)
+          (let ((elems (list)))
+            (define rb-p-arr-loop
+              (fn ()
+                (when (not (or (= (rb-p-type) "rbracket") (= (rb-p-type) "eof")))
+                  (do
+                    (if (and (= (rb-p-type) "op") (= (rb-p-val) "*"))
+                      (do
+                        (rb-p-advance!)
+                        (append! elems {:type "splat" :value (rb-p-parse-assign)}))
+                      (append! elems (rb-p-parse-assign)))
+                    (rb-p-skip-newlines!)
+                    (when (= (rb-p-type) "comma")
+                      (do (rb-p-advance!) (rb-p-skip-newlines!)))
+                    (rb-p-arr-loop)))))
+            (rb-p-arr-loop)
+            (rb-p-expect! "rbracket")
+            {:type "array" :elems elems})))
+
+      ;; {k: v, k => v, ...}
+      (define rb-p-parse-hash
+        (fn ()
+          (rb-p-advance!)
+          (rb-p-skip-newlines!)
+          (let ((pairs (list)))
+            (define rb-p-hash-loop
+              (fn ()
+                (when (not (or (= (rb-p-type) "rbrace") (= (rb-p-type) "eof")))
+                  (do
+                    (let ((key nil) (val nil) (style nil))
+                      (cond
+                        ((and (or (= (rb-p-type) "ident") (= (rb-p-type) "const"))
+                              (= (get (rb-p-peek 1) :type) "colon"))
+                          (do
+                            (set! key {:type "lit-sym" :value (rb-p-val)})
+                            (set! style "colon")
+                            (rb-p-advance!)
+                            (rb-p-advance!)))
+                        (:else
+                          (do
+                            (set! key (rb-p-parse-assign))
+                            (set! style "rocket")
+                            (when (and (= (rb-p-type) "op") (= (rb-p-val) "=>"))
+                              (rb-p-advance!)))))
+                      (rb-p-skip-newlines!)
+                      (set! val (rb-p-parse-assign))
+                      (append! pairs {:key key :val val :style style}))
+                    (rb-p-skip-newlines!)
+                    (when (= (rb-p-type) "comma")
+                      (do (rb-p-advance!) (rb-p-skip-newlines!)))
+                    (rb-p-hash-loop)))))
+            (rb-p-hash-loop)
+            (rb-p-expect! "rbrace")
+            {:type "hash" :pairs pairs})))
+
+      ;; (a, *b, **c, &d)
+      (define rb-p-parse-args-parens
+        (fn ()
+          (rb-p-advance!)
+          (rb-p-skip-newlines!)
+          (let ((args (list)))
+            (define rb-p-ap-loop
+              (fn ()
+                (when (not (or (= (rb-p-type) "rparen") (= (rb-p-type) "eof")))
+                  (do
+                    (cond
+                      ((and (= (rb-p-type) "op") (= (rb-p-val) "**"))
+                        (do (rb-p-advance!)
+                            (append! args {:type "dsplat" :value (rb-p-parse-assign)})))
+                      ((and (= (rb-p-type) "op") (= (rb-p-val) "*"))
+                        (do (rb-p-advance!)
+                            (append! args {:type "splat" :value (rb-p-parse-assign)})))
+                      ((and (= (rb-p-type) "op") (= (rb-p-val) "&"))
+                        (do (rb-p-advance!)
+                            (append! args {:type "block-pass" :value (rb-p-parse-assign)})))
+                      (:else (append! args (rb-p-parse-assign))))
+                    (rb-p-skip-newlines!)
+                    (when (= (rb-p-type) "comma")
+                      (do (rb-p-advance!) (rb-p-skip-newlines!)))
+                    (rb-p-ap-loop)))))
+            (rb-p-ap-loop)
+            (rb-p-expect! "rparen")
+            args)))
+
+      ;; No-paren arg list up to sep/end-keyword
+      (define rb-p-parse-args-bare
+        (fn ()
+          (let ((args (list)) (going true))
+            (define rb-p-ab-loop
+              (fn ()
+                (when (and going
+                           (not (rb-p-sep?))
+                           (not (= (rb-p-type) "eof"))
+                           (not (= (rb-p-type) "rparen"))
+                           (not (= (rb-p-type) "rbracket"))
+                           (not (= (rb-p-type) "rbrace"))
+                           (not (and (= (rb-p-type) "keyword")
+                                     (contains? (list "end" "else" "elsif" "when"
+                                                      "rescue" "ensure" "then" "do")
+                                                (rb-p-val)))))
+                  (do
+                    (cond
+                      ((and (= (rb-p-type) "op") (= (rb-p-val) "*"))
+                        (do (rb-p-advance!)
+                            (append! args {:type "splat" :value (rb-p-parse-assign)})))
+                      ((and (= (rb-p-type) "op") (= (rb-p-val) "**"))
+                        (do (rb-p-advance!)
+                            (append! args {:type "dsplat" :value (rb-p-parse-assign)})))
+                      ((and (= (rb-p-type) "op") (= (rb-p-val) "&"))
+                        (do (rb-p-advance!)
+                            (append! args {:type "block-pass" :value (rb-p-parse-assign)})))
+                      (:else (append! args (rb-p-parse-assign))))
+                    (if (= (rb-p-type) "comma")
+                      (do (rb-p-advance!) (rb-p-skip-newlines!) (rb-p-ab-loop))
+                      (set! going false))))))
+            (rb-p-ab-loop)
+            args)))
+
+      ;; Primary expression
+      (define rb-p-parse-primary
+        (fn ()
+          (cond
+            ((= (rb-p-type) "int")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "lit-int" :value v}))
+            ((= (rb-p-type) "float")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "lit-float" :value v}))
+            ((= (rb-p-type) "string")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "lit-str" :value v}))
+            ((= (rb-p-type) "symbol")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "lit-sym" :value v}))
+            ((= (rb-p-type) "words")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "lit-words" :elems v}))
+            ((= (rb-p-type) "isymbols")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "lit-isyms" :elems v}))
+            ((= (rb-p-type) "ivar")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "ivar" :name v}))
+            ((= (rb-p-type) "cvar")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "cvar" :name v}))
+            ((= (rb-p-type) "gvar")
+              (let ((v (rb-p-val))) (rb-p-advance!) {:type "gvar" :name v}))
+            ((= (rb-p-type) "const")
+              (rb-p-parse-const-path))
+            ((= (rb-p-type) "ident")
+              (let ((name (rb-p-val)))
+                (rb-p-advance!)
+                (if (= (rb-p-type) "lparen")
+                  (let ((args (rb-p-parse-args-parens))
+                        (blk (rb-p-parse-block)))
+                    {:type "send" :name name :args args :block blk})
+                  {:type "send" :name name :args (list) :block nil})))
+            ((= (rb-p-type) "keyword")
+              (cond
+                ((= (rb-p-val) "nil")
+                  (do (rb-p-advance!) {:type "lit-nil"}))
+                ((= (rb-p-val) "true")
+                  (do (rb-p-advance!) {:type "lit-bool" :value true}))
+                ((= (rb-p-val) "false")
+                  (do (rb-p-advance!) {:type "lit-bool" :value false}))
+                ((= (rb-p-val) "self")
+                  (do (rb-p-advance!) {:type "self"}))
+                ((= (rb-p-val) "super")
+                  (do
+                    (rb-p-advance!)
+                    (let ((args (if (= (rb-p-type) "lparen")
+                                   (rb-p-parse-args-parens) (list)))
+                          (blk (rb-p-parse-block)))
+                      {:type "send" :name "super" :args args :block blk})))
+                (:else
+                  {:type "error"
+                   :msg (join "" (list "unexpected kw " (rb-p-val)))})))
+            ((= (rb-p-type) "lbracket")
+              (rb-p-parse-array))
+            ((= (rb-p-type) "lbrace")
+              (rb-p-parse-hash))
+            ((= (rb-p-type) "lparen")
+              (do
+                (rb-p-advance!)
+                (rb-p-skip-seps!)
+                (let ((node (rb-p-parse-expr)))
+                  (rb-p-skip-seps!)
+                  (rb-p-expect! "rparen")
+                  node)))
+            (:else
+              (do
+                (rb-p-advance!)
+                {:type "error"
+                 :msg (join "" (list "unexpected " (rb-p-type)
+                                     " '" (or (rb-p-val) "") "'"))})))))
+
+      ;; .method  ::Const  [index]  chains
+      (define rb-p-parse-postfix
+        (fn ()
+          (let ((node (rb-p-parse-primary)))
+            (define rb-p-pf-loop
+              (fn ()
+                (cond
+                  ((= (rb-p-type) "dot")
+                    (do
+                      (rb-p-advance!)
+                      (let ((method (rb-p-val)))
+                        (rb-p-advance!)
+                        (let ((args (if (= (rb-p-type) "lparen")
+                                       (rb-p-parse-args-parens) (list)))
+                              (blk (rb-p-parse-block)))
+                          (set! node {:type "call" :recv node :method method
+                                      :args args :block blk})
+                          (rb-p-pf-loop)))))
+                  ((= (rb-p-type) "dcolon")
+                    (do
+                      (rb-p-advance!)
+                      (let ((name (rb-p-val)))
+                        (rb-p-advance!)
+                        (if (= (rb-p-type) "lparen")
+                          (let ((args (rb-p-parse-args-parens))
+                                (blk (rb-p-parse-block)))
+                            (set! node {:type "call" :recv node :method name
+                                        :args args :block blk}))
+                          (set! node {:type "const-path" :left node :name name}))
+                        (rb-p-pf-loop))))
+                  ((= (rb-p-type) "lbracket")
+                    (do
+                      (rb-p-advance!)
+                      (rb-p-skip-newlines!)
+                      (let ((idxargs (list)))
+                        (define rb-p-idx-loop
+                          (fn ()
+                            (when (not (or (= (rb-p-type) "rbracket") (= (rb-p-type) "eof")))
+                              (do
+                                (append! idxargs (rb-p-parse-assign))
+                                (when (= (rb-p-type) "comma")
+                                  (do (rb-p-advance!) (rb-p-skip-newlines!)))
+                                (rb-p-idx-loop)))))
+                        (rb-p-idx-loop)
+                        (rb-p-expect! "rbracket")
+                        (set! node {:type "index" :recv node :args idxargs})
+                        (rb-p-pf-loop))))
+                  (:else nil))))
+            (rb-p-pf-loop)
+            node)))
+
+      (define rb-p-parse-unary
+        (fn ()
+          (cond
+            ((and (= (rb-p-type) "op") (= (rb-p-val) "!"))
+              (do (rb-p-advance!)
+                  {:type "unop" :op "!" :value (rb-p-parse-unary)}))
+            ((and (= (rb-p-type) "op") (= (rb-p-val) "~"))
+              (do (rb-p-advance!)
+                  {:type "unop" :op "~" :value (rb-p-parse-unary)}))
+            ((and (= (rb-p-type) "op") (= (rb-p-val) "-"))
+              (do (rb-p-advance!)
+                  {:type "unop" :op "-" :value (rb-p-parse-unary)}))
+            ((and (= (rb-p-type) "op") (= (rb-p-val) "+"))
+              (do (rb-p-advance!) (rb-p-parse-unary)))
+            (:else (rb-p-parse-postfix)))))
+
+      (define rb-p-parse-power
+        (fn ()
+          (let ((node (rb-p-parse-unary)))
+            (if (and (= (rb-p-type) "op") (= (rb-p-val) "**"))
+              (do (rb-p-advance!)
+                  {:type "binop" :op "**" :left node :right (rb-p-parse-power)})
+              node))))
+
+      (define rb-p-parse-mul
+        (fn ()
+          (let ((node (rb-p-parse-power)))
+            (define rb-p-mul-loop
+              (fn ()
+                (if (and (= (rb-p-type) "op")
+                         (or (= (rb-p-val) "*") (= (rb-p-val) "/") (= (rb-p-val) "%")))
+                  (let ((op (rb-p-val)))
+                    (rb-p-advance!)
+                    (set! node {:type "binop" :op op :left node :right (rb-p-parse-power)})
+                    (rb-p-mul-loop))
+                  node)))
+            (rb-p-mul-loop))))
+
+      (define rb-p-parse-add
+        (fn ()
+          (let ((node (rb-p-parse-mul)))
+            (define rb-p-add-loop
+              (fn ()
+                (if (and (= (rb-p-type) "op")
+                         (or (= (rb-p-val) "+") (= (rb-p-val) "-")))
+                  (let ((op (rb-p-val)))
+                    (rb-p-advance!)
+                    (set! node {:type "binop" :op op :left node :right (rb-p-parse-mul)})
+                    (rb-p-add-loop))
+                  node)))
+            (rb-p-add-loop))))
+
+      (define rb-p-parse-shift
+        (fn ()
+          (let ((node (rb-p-parse-add)))
+            (define rb-p-sh-loop
+              (fn ()
+                (if (and (= (rb-p-type) "op")
+                         (or (= (rb-p-val) "<<") (= (rb-p-val) ">>")))
+                  (let ((op (rb-p-val)))
+                    (rb-p-advance!)
+                    (set! node {:type "binop" :op op :left node :right (rb-p-parse-add)})
+                    (rb-p-sh-loop))
+                  node)))
+            (rb-p-sh-loop))))
+
+      (define rb-p-parse-bitand
+        (fn ()
+          (let ((node (rb-p-parse-shift)))
+            (define rb-p-ba-loop
+              (fn ()
+                (if (and (= (rb-p-type) "op") (= (rb-p-val) "&"))
+                  (do
+                    (rb-p-advance!)
+                    (set! node {:type "binop" :op "&" :left node :right (rb-p-parse-shift)})
+                    (rb-p-ba-loop))
+                  node)))
+            (rb-p-ba-loop))))
+
+      ;; | is "pipe" token (not "op")
+      (define rb-p-parse-bitor
+        (fn ()
+          (let ((node (rb-p-parse-bitand)))
+            (define rb-p-bo-loop
+              (fn ()
+                (cond
+                  ((= (rb-p-type) "pipe")
+                    (do
+                      (rb-p-advance!)
+                      (set! node {:type "binop" :op "|" :left node :right (rb-p-parse-bitand)})
+                      (rb-p-bo-loop)))
+                  ((and (= (rb-p-type) "op") (= (rb-p-val) "^"))
+                    (do
+                      (rb-p-advance!)
+                      (set! node {:type "binop" :op "^" :left node :right (rb-p-parse-bitand)})
+                      (rb-p-bo-loop)))
+                  (:else node))))
+            (rb-p-bo-loop))))
+
+      (define rb-p-parse-comparison
+        (fn ()
+          (let ((node (rb-p-parse-bitor)))
+            (if (and (= (rb-p-type) "op")
+                     (contains? (list "==" "!=" "<" ">" "<=" ">="
+                                      "<=>" "===" "=~" "!~") (rb-p-val)))
+              (let ((op (rb-p-val)))
+                (rb-p-advance!)
+                {:type "binop" :op op :left node :right (rb-p-parse-bitor)})
+              node))))
+
+      (define rb-p-parse-not
+        (fn ()
+          (if (and (= (rb-p-type) "keyword") (= (rb-p-val) "not"))
+            (do (rb-p-advance!)
+                {:type "not" :value (rb-p-parse-not)})
+            (rb-p-parse-comparison))))
+
+      (define rb-p-parse-and
+        (fn ()
+          (let ((node (rb-p-parse-not)))
+            (define rb-p-and-loop
+              (fn ()
+                (cond
+                  ((and (= (rb-p-type) "op") (= (rb-p-val) "&&"))
+                    (do
+                      (rb-p-advance!)
+                      (set! node {:type "binop" :op "&&" :left node :right (rb-p-parse-not)})
+                      (rb-p-and-loop)))
+                  ((and (= (rb-p-type) "keyword") (= (rb-p-val) "and"))
+                    (do
+                      (rb-p-advance!)
+                      (set! node {:type "binop" :op "and" :left node :right (rb-p-parse-not)})
+                      (rb-p-and-loop)))
+                  (:else node))))
+            (rb-p-and-loop))))
+
+      (define rb-p-parse-or
+        (fn ()
+          (let ((node (rb-p-parse-and)))
+            (define rb-p-or-loop
+              (fn ()
+                (cond
+                  ((and (= (rb-p-type) "op") (= (rb-p-val) "||"))
+                    (do
+                      (rb-p-advance!)
+                      (set! node {:type "binop" :op "||" :left node :right (rb-p-parse-and)})
+                      (rb-p-or-loop)))
+                  ((and (= (rb-p-type) "keyword") (= (rb-p-val) "or"))
+                    (do
+                      (rb-p-advance!)
+                      (set! node {:type "binop" :op "or" :left node :right (rb-p-parse-and)})
+                      (rb-p-or-loop)))
+                  (:else node))))
+            (rb-p-or-loop))))
+
+      (define rb-p-parse-range
+        (fn ()
+          (let ((node (rb-p-parse-or)))
+            (cond
+              ((= (rb-p-type) "dotdot")
+                (do (rb-p-advance!)
+                    {:type "range" :from node :to (rb-p-parse-or) :exclusive false}))
+              ((= (rb-p-type) "dotdotdot")
+                (do (rb-p-advance!)
+                    {:type "range" :from node :to (rb-p-parse-or) :exclusive true}))
+              (:else node)))))
+
+      (define rb-p-parse-assign
+        (fn ()
+          (let ((node (rb-p-parse-range)))
+            (cond
+              ((and (= (rb-p-type) "op") (= (rb-p-val) "="))
+                (do (rb-p-advance!)
+                    {:type "assign" :target node :value (rb-p-parse-assign)}))
+              ((and (= (rb-p-type) "op")
+                    (contains? (list "+=" "-=" "*=" "/=" "%=" "**="
+                                     "<<=" ">>=" "&=" "|=" "^=" "&&=" "||=")
+                               (rb-p-val)))
+                (let ((op (substring (rb-p-val) 0 (- (len (rb-p-val)) 1))))
+                  (rb-p-advance!)
+                  {:type "op-assign" :target node :op op :value (rb-p-parse-assign)}))
+              (:else node)))))
+
+      (define rb-p-parse-expr
+        (fn () (rb-p-parse-assign)))
+
+      ;; e, e, ... → single node or array
+      (define rb-p-parse-multi-val
+        (fn ()
+          (let ((vals (list)))
+            (define rb-p-mv-loop
+              (fn ()
+                (append! vals (rb-p-parse-assign))
+                (when (= (rb-p-type) "comma")
+                  (do (rb-p-advance!) (rb-p-skip-newlines!) (rb-p-mv-loop)))))
+            (rb-p-mv-loop)
+            (if (= (len vals) 1)
+              (nth vals 0)
+              {:type "array" :elems vals}))))
+
+      ;; a, b, *c = rhs
+      (define rb-p-parse-massign
+        (fn ()
+          (let ((targets (list)))
+            (define rb-p-ma-loop
+              (fn ()
+                (cond
+                  ((and (= (rb-p-type) "op") (= (rb-p-val) "*"))
+                    (do
+                      (rb-p-advance!)
+                      (if (= (rb-p-type) "ident")
+                        (do
+                          (append! targets {:type "splat-target" :name (rb-p-val)})
+                          (rb-p-advance!))
+                        (append! targets {:type "splat-target" :name nil}))))
+                  ((= (rb-p-type) "ident")
+                    (do (append! targets {:type "lvar" :name (rb-p-val)}) (rb-p-advance!)))
+                  ((= (rb-p-type) "ivar")
+                    (do (append! targets {:type "ivar" :name (rb-p-val)}) (rb-p-advance!)))
+                  ((= (rb-p-type) "cvar")
+                    (do (append! targets {:type "cvar" :name (rb-p-val)}) (rb-p-advance!)))
+                  ((= (rb-p-type) "gvar")
+                    (do (append! targets {:type "gvar" :name (rb-p-val)}) (rb-p-advance!)))
+                  ((= (rb-p-type) "const")
+                    (do (append! targets {:type "const" :name (rb-p-val)}) (rb-p-advance!)))
+                  (:else nil))
+                (when (= (rb-p-type) "comma")
+                  (do (rb-p-advance!) (rb-p-skip-newlines!) (rb-p-ma-loop)))))
+            (rb-p-ma-loop)
+            (rb-p-advance!)
+            {:type "massign" :targets targets :value (rb-p-parse-multi-val)})))
+
+
+      ;; if cond [then] body [elsif cond [then] body ...] [else body] end
+      (define rb-p-parse-if
+        (fn ()
+          (rb-p-advance!)
+          (let ((cond-val (rb-p-parse-expr)))
+            (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "then"))
+              (rb-p-advance!))
+            (rb-p-skip-seps!)
+            (let ((then-body (rb-p-parse-stmts (list "end" "else" "elsif"))))
+              (let ((elsifs (list)) (else-body nil))
+                (define rb-p-elsif-loop
+                  (fn ()
+                    (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "elsif"))
+                      (do
+                        (rb-p-advance!)
+                        (let ((ec (rb-p-parse-expr)))
+                          (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "then"))
+                            (rb-p-advance!))
+                          (rb-p-skip-seps!)
+                          (let ((eb (rb-p-parse-stmts (list "end" "else" "elsif"))))
+                            (append! elsifs {:cond ec :then eb})
+                            (rb-p-elsif-loop)))))))
+                (rb-p-elsif-loop)
+                (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "else"))
+                  (do
+                    (rb-p-advance!)
+                    (rb-p-skip-seps!)
+                    (set! else-body (rb-p-parse-stmts (list "end")))))
+                (rb-p-expect-kw! "end")
+                {:type "if" :cond cond-val :then then-body
+                 :elsif elsifs :else else-body})))))
+
+      ;; unless cond [then] body [else body] end
+      (define rb-p-parse-unless
+        (fn ()
+          (rb-p-advance!)
+          (let ((cond-val (rb-p-parse-expr)))
+            (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "then"))
+              (rb-p-advance!))
+            (rb-p-skip-seps!)
+            (let ((then-body (rb-p-parse-stmts (list "end" "else"))))
+              (let ((else-body nil))
+                (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "else"))
+                  (do
+                    (rb-p-advance!)
+                    (rb-p-skip-seps!)
+                    (set! else-body (rb-p-parse-stmts (list "end")))))
+                (rb-p-expect-kw! "end")
+                {:type "unless" :cond cond-val :then then-body :else else-body})))))
+
+      ;; while cond [do] body end
+      (define rb-p-parse-while
+        (fn ()
+          (rb-p-advance!)
+          (let ((cond-val (rb-p-parse-expr)))
+            (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "do"))
+              (rb-p-advance!))
+            (rb-p-skip-seps!)
+            (let ((body (rb-p-parse-stmts (list "end"))))
+              (rb-p-expect-kw! "end")
+              {:type "while" :cond cond-val :body body}))))
+
+      ;; until cond [do] body end
+      (define rb-p-parse-until
+        (fn ()
+          (rb-p-advance!)
+          (let ((cond-val (rb-p-parse-expr)))
+            (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "do"))
+              (rb-p-advance!))
+            (rb-p-skip-seps!)
+            (let ((body (rb-p-parse-stmts (list "end"))))
+              (rb-p-expect-kw! "end")
+              {:type "until" :cond cond-val :body body}))))
+
+      ;; for var in iter [do] body end
+      (define rb-p-parse-for
+        (fn ()
+          (rb-p-advance!)
+          (let ((var (rb-p-val)))
+            (rb-p-advance!)
+            (rb-p-expect-kw! "in")
+            (let ((iter (rb-p-parse-expr)))
+              (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "do"))
+                (rb-p-advance!))
+              (rb-p-skip-seps!)
+              (let ((body (rb-p-parse-stmts (list "end"))))
+                (rb-p-expect-kw! "end")
+                {:type "for" :var var :iter iter :body body})))))
+
+      ;; case [expr] when val[, val] [then] body... [else body] end
+      (define rb-p-parse-case
+        (fn ()
+          (rb-p-advance!)
+          (let ((case-val (if (rb-p-sep?) nil (rb-p-parse-expr))))
+            (rb-p-skip-seps!)
+            (let ((whens (list)) (else-body nil))
+              (define rb-p-when-loop
+                (fn ()
+                  (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "when"))
+                    (do
+                      (rb-p-advance!)
+                      (let ((wvals (list)))
+                        (define rb-p-wval-loop
+                          (fn ()
+                            (append! wvals (rb-p-parse-assign))
+                            (when (= (rb-p-type) "comma")
+                              (do (rb-p-advance!) (rb-p-skip-newlines!) (rb-p-wval-loop)))))
+                        (rb-p-wval-loop)
+                        (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "then"))
+                          (rb-p-advance!))
+                        (rb-p-skip-seps!)
+                        (let ((wb (rb-p-parse-stmts (list "end" "else" "when"))))
+                          (append! whens {:values wvals :body wb})
+                          (rb-p-when-loop)))))))
+              (rb-p-when-loop)
+              (when (and (= (rb-p-type) "keyword") (= (rb-p-val) "else"))
+                (do
+                  (rb-p-advance!)
+                  (rb-p-skip-seps!)
+                  (set! else-body (rb-p-parse-stmts (list "end")))))
+              (rb-p-expect-kw! "end")
+              {:type "case" :value case-val :whens whens :else else-body}))))
+
+      (define rb-p-parse-stmt
+        (fn ()
+          (let ((node
+                  (cond
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "def"))
+                      (rb-p-parse-def))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "class"))
+                      (rb-p-parse-class))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "module"))
+                      (rb-p-parse-module))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "if"))
+                      (rb-p-parse-if))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "unless"))
+                      (rb-p-parse-unless))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "while"))
+                      (rb-p-parse-while))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "until"))
+                      (rb-p-parse-until))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "case"))
+                      (rb-p-parse-case))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "for"))
+                      (rb-p-parse-for))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "return"))
+                      (do (rb-p-advance!)
+                          {:type "return"
+                           :value (if (or (rb-p-sep?) (= (rb-p-type) "eof"))
+                                     nil (rb-p-parse-multi-val))}))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "yield"))
+                      (do (rb-p-advance!)
+                          {:type "yield"
+                           :args (cond
+                                   ((= (rb-p-type) "lparen") (rb-p-parse-args-parens))
+                                   ((or (rb-p-sep?) (= (rb-p-type) "eof")) (list))
+                                   (:else (rb-p-parse-args-bare)))}))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "break"))
+                      (do (rb-p-advance!)
+                          {:type "break"
+                           :value (if (or (rb-p-sep?) (= (rb-p-type) "eof"))
+                                     nil (rb-p-parse-expr))}))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "next"))
+                      (do (rb-p-advance!)
+                          {:type "next"
+                           :value (if (or (rb-p-sep?) (= (rb-p-type) "eof"))
+                                     nil (rb-p-parse-expr))}))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "redo"))
+                      (do (rb-p-advance!) {:type "redo"}))
+                    ((and (= (rb-p-type) "keyword") (= (rb-p-val) "raise"))
+                      (do (rb-p-advance!)
+                          {:type "raise"
+                           :value (if (or (rb-p-sep?) (= (rb-p-type) "eof"))
+                                     nil (rb-p-parse-expr))}))
+                    ;; Massign: token followed by comma
+                    ((and (or (= (rb-p-type) "ident") (= (rb-p-type) "ivar")
+                              (= (rb-p-type) "cvar") (= (rb-p-type) "gvar")
+                              (= (rb-p-type) "const"))
+                          (= (get (rb-p-peek 1) :type) "comma"))
+                      (rb-p-parse-massign))
+                    (:else
+                      (let ((nd (rb-p-parse-assign)))
+                        (if (and (= (get nd :type) "send")
+                                 (= (len (get nd :args)) 0)
+                                 (nil? (get nd :block)))
+                          (cond
+                            ((or (and (= (rb-p-type) "keyword") (= (rb-p-val) "do"))
+                                 (= (rb-p-type) "lbrace"))
+                              (let ((blk (rb-p-parse-block)))
+                                {:type "send" :name (get nd :name)
+                                 :args (list) :block blk}))
+                            ((and (not (rb-p-sep?))
+                                  (not (= (rb-p-type) "eof"))
+                                  (not (= (rb-p-type) "op"))
+                                  (not (= (rb-p-type) "dot"))
+                                  (not (= (rb-p-type) "dcolon"))
+                                  (not (= (rb-p-type) "rparen"))
+                                  (not (= (rb-p-type) "rbracket"))
+                                  (not (= (rb-p-type) "rbrace"))
+                                  (not (= (rb-p-type) "lbrace"))
+                                  (not (and (= (rb-p-type) "keyword")
+                                            (contains? (list "end" "else" "elsif"
+                                                             "when" "rescue" "ensure"
+                                                             "then" "do" "and" "or"
+                                                             "not" "if" "unless"
+                                                             "while" "until")
+                                                       (rb-p-val)))))
+                              (let ((args (rb-p-parse-args-bare))
+                                    (blk (rb-p-parse-block)))
+                                (if (> (len args) 0)
+                                  {:type "send" :name (get nd :name)
+                                   :args args :block blk}
+                                  nd)))
+                            (:else nd))
+                          nd))))))
+            ;; Postfix modifiers
+            (cond
+              ((and (= (rb-p-type) "keyword") (= (rb-p-val) "if"))
+                (do (rb-p-advance!)
+                    {:type "postfix-if" :cond (rb-p-parse-expr) :body node}))
+              ((and (= (rb-p-type) "keyword") (= (rb-p-val) "unless"))
+                (do (rb-p-advance!)
+                    {:type "postfix-unless" :cond (rb-p-parse-expr) :body node}))
+              ((and (= (rb-p-type) "keyword") (= (rb-p-val) "while"))
+                (do (rb-p-advance!)
+                    {:type "postfix-while" :cond (rb-p-parse-expr) :body node}))
+              ((and (= (rb-p-type) "keyword") (= (rb-p-val) "until"))
+                (do (rb-p-advance!)
+                    {:type "postfix-until" :cond (rb-p-parse-expr) :body node}))
+              (:else node)))))
+
+      (define rb-p-parse-stmts
+        (fn (terminators)
+          (let ((stmts (list)))
+            (define rb-p-at-term?
+              (fn ()
+                (or (= (rb-p-type) "eof")
+                    (and (= (rb-p-type) "keyword")
+                         (contains? terminators (rb-p-val)))
+                    (and (= (rb-p-type) "rbrace")
+                         (contains? terminators "rbrace")))))
+            (define rb-p-ps-loop
+              (fn ()
+                (rb-p-skip-seps!)
+                (when (not (rb-p-at-term?))
+                  (do
+                    (append! stmts (rb-p-parse-stmt))
+                    (rb-p-skip-seps!)
+                    (rb-p-ps-loop)))))
+            (rb-p-ps-loop)
+            stmts)))
+
+      {:type "program" :stmts (rb-p-parse-stmts (list))})))
+
+(define rb-parse-str
+  (fn (src) (rb-parse (rb-tokenize src))))

lib/ruby/test.sh

@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+# Ruby-on-SX test runner.
+# Usage:
+#   bash lib/ruby/test.sh              # run all tests
+#   bash lib/ruby/test.sh -v           # verbose
+#   bash lib/ruby/test.sh tests/parse.sx   # single file
+
+set -euo pipefail
+cd "$(git rev-parse --show-toplevel)"
+
+SX_SERVER="hosts/ocaml/_build/default/bin/sx_server.exe"
+if [ ! -x "$SX_SERVER" ]; then
+  MAIN_ROOT=$(git worktree list | head -1 | awk '{print $1}')
+  if [ -x "$MAIN_ROOT/$SX_SERVER" ]; then
+    SX_SERVER="$MAIN_ROOT/$SX_SERVER"
+  else
+    echo "ERROR: sx_server.exe not found."
+    exit 1
+  fi
+fi
+
+VERBOSE=""
+FILES=()
+for arg in "$@"; do
+  case "$arg" in
+    -v|--verbose) VERBOSE=1 ;;
+    *) FILES+=("$arg") ;;
+  esac
+done
+
+if [ ${#FILES[@]} -eq 0 ]; then
+  mapfile -t FILES < <(find lib/ruby/tests -maxdepth 2 -name '*.sx' | sort)
+fi
+
+TOTAL_PASS=0
+TOTAL_FAIL=0
+FAILED_FILES=()
+
+for FILE in "${FILES[@]}"; do
+  [ -f "$FILE" ] || { echo "skip $FILE (not found)"; continue; }
+  TMPFILE=$(mktemp)
+  # Build epoch sequence: load runtime files, then test file, then eval summary.
+  {
+    echo "(epoch 1)"
+    echo "(load \"lib/ruby/tokenizer.sx\")"
+    if [ -f "lib/ruby/parser.sx" ]; then
+      echo "(epoch 2)"
+      echo "(load \"lib/ruby/parser.sx\")"
+    fi
+    echo "(epoch 3)"
+    echo "(load \"$FILE\")"
+    echo "(epoch 4)"
+    echo "(eval \"(list rb-test-pass rb-test-fail)\")"
+  } > "$TMPFILE"
+
+  OUTPUT=$(timeout 60 "$SX_SERVER" < "$TMPFILE" 2>&1 || true)
+  rm -f "$TMPFILE"
+
+  # Extract epoch 4 result: (ok-len 4 N)\n<val>  or  (ok 4 <val>)
+  LINE=$(printf '%s\n' "$OUTPUT" | awk '/^\(ok-len 4 / {getline; print; exit}')
+  if [ -z "$LINE" ]; then
+    LINE=$(printf '%s\n' "$OUTPUT" \
+           | grep -E '^\(ok 4 \([0-9]+ [0-9]+\)\)' | tail -1 \
+           | sed -E 's/^\(ok 4 //; s/\)$//')
+  fi
+  if [ -z "$LINE" ]; then
+    echo "✗ $FILE: could not extract summary"
+    printf '%s\n' "$OUTPUT" | grep -v '^(ok ' | tail -10
+    TOTAL_FAIL=$((TOTAL_FAIL + 1))
+    FAILED_FILES+=("$FILE")
+    continue
+  fi
+  P=$(printf '%s\n' "$LINE" | sed -E 's/^\(([0-9]+) ([0-9]+)\).*/\1/')
+  F=$(printf '%s\n' "$LINE" | sed -E 's/^\(([0-9]+) ([0-9]+)\).*/\2/')
+  TOTAL_PASS=$((TOTAL_PASS + P))
+  TOTAL_FAIL=$((TOTAL_FAIL + F))
+  if [ "$F" -gt 0 ]; then
+    FAILED_FILES+=("$FILE")
+    printf '✗ %-40s %d/%d\n' "$FILE" "$P" "$((P+F))"
+  elif [ "$VERBOSE" = "1" ]; then
+    printf '✓ %-40s %d passed\n' "$FILE" "$P"
+  fi
+done
+
+TOTAL=$((TOTAL_PASS + TOTAL_FAIL))
+if [ $TOTAL_FAIL -eq 0 ]; then
+  echo "✓ $TOTAL_PASS/$TOTAL ruby-on-sx tests passed"
+else
+  echo "✗ $TOTAL_PASS/$TOTAL passed, $TOTAL_FAIL failed in: ${FAILED_FILES[*]}"
+fi
+
+[ $TOTAL_FAIL -eq 0 ]

lib/ruby/tests/parse.sx

@@ -0,0 +1,439 @@
+;; Parser tests for Ruby 2.7 subset.
+
+(define rb-deep=?
+  (fn (a b)
+    (cond
+      ((= a b) true)
+      ((and (dict? a) (dict? b))
+        (let ((ak (keys a)) (bk (keys b)))
+          (if (not (= (len ak) (len bk)))
+            false
+            (every?
+              (fn (k)
+                (and (has-key? b k) (rb-deep=? (get a k) (get b k))))
+              ak))))
+      ((and (list? a) (list? b))
+        (if (not (= (len a) (len b)))
+          false
+          (let ((i 0) (ok true))
+            (define rb-de-loop
+              (fn ()
+                (when (and ok (< i (len a)))
+                  (do
+                    (when (not (rb-deep=? (nth a i) (nth b i)))
+                      (set! ok false))
+                    (set! i (+ i 1))
+                    (rb-de-loop)))))
+            (rb-de-loop)
+            ok)))
+      (:else false))))
+
+(define rb-test-pass 0)
+(define rb-test-fail 0)
+(define rb-test-fails (list))
+
+(define rb-test
+  (fn (name actual expected)
+    (if (rb-deep=? actual expected)
+      (set! rb-test-pass (+ rb-test-pass 1))
+      (do
+        (set! rb-test-fail (+ rb-test-fail 1))
+        (append! rb-test-fails {:name name :actual actual :expected expected})))))
+
+;; Shorthand: parse src and extract :stmts list
+(define rb-p-stmts
+  (fn (src)
+    (get (rb-parse-str src) :stmts)))
+
+;; Shorthand: parse and get first statement
+(define rb-p-first
+  (fn (src)
+    (nth (rb-p-stmts src) 0)))
+
+;; ── Literals ─────────────────────────────────────────────────────────────────
+
+(rb-test "int literal"
+  (rb-p-first "42")
+  {:type "lit-int" :value 42})
+
+(rb-test "negative int"
+  (rb-p-first "-7")
+  {:type "unop" :op "-" :value {:type "lit-int" :value 7}})
+
+(rb-test "float literal"
+  (rb-p-first "3.14")
+  {:type "lit-float" :value "3.14"})
+
+(rb-test "string literal"
+  (rb-p-first "\"hello\"")
+  {:type "lit-str" :value "hello"})
+
+(rb-test "symbol literal"
+  (rb-p-first ":foo")
+  {:type "lit-sym" :value "foo"})
+
+(rb-test "nil literal"
+  (rb-p-first "nil")
+  {:type "lit-nil"})
+
+(rb-test "true literal"
+  (rb-p-first "true")
+  {:type "lit-bool" :value true})
+
+(rb-test "false literal"
+  (rb-p-first "false")
+  {:type "lit-bool" :value false})
+
+(rb-test "self"
+  (rb-p-first "self")
+  {:type "self"})
+
+(rb-test "%w[] words"
+  (rb-p-first "%w[a b c]")
+  {:type "lit-words" :elems (list "a" "b" "c")})
+
+(rb-test "%i[] isymbols"
+  (rb-p-first "%i[x y]")
+  {:type "lit-isyms" :elems (list "x" "y")})
+
+;; ── Variables ─────────────────────────────────────────────────────────────────
+
+(rb-test "local var / send"
+  (rb-p-first "x")
+  {:type "send" :name "x" :args (list) :block nil})
+
+(rb-test "ivar"
+  (rb-p-first "@foo")
+  {:type "ivar" :name "@foo"})
+
+(rb-test "cvar"
+  (rb-p-first "@@count")
+  {:type "cvar" :name "@@count"})
+
+(rb-test "gvar"
+  (rb-p-first "$stdout")
+  {:type "gvar" :name "$stdout"})
+
+(rb-test "constant"
+  (rb-p-first "Foo")
+  {:type "const" :name "Foo"})
+
+(rb-test "const path"
+  (rb-p-first "Foo::Bar")
+  {:type "const-path"
+   :left {:type "const" :name "Foo"}
+   :name "Bar"})
+
+(rb-test "triple const path"
+  (rb-p-first "A::B::C")
+  {:type "const-path"
+   :left {:type "const-path"
+          :left {:type "const" :name "A"}
+          :name "B"}
+   :name "C"})
+
+;; ── Arrays and Hashes ─────────────────────────────────────────────────────────
+
+(rb-test "empty array"
+  (rb-p-first "[]")
+  {:type "array" :elems (list)})
+
+(rb-test "array literal"
+  (rb-p-first "[1, 2, 3]")
+  {:type "array" :elems (list {:type "lit-int" :value 1}
+                               {:type "lit-int" :value 2}
+                               {:type "lit-int" :value 3})})
+
+(rb-test "hash colon style"
+  (get (rb-p-first "{a: 1}") :type)
+  "hash")
+
+(rb-test "hash pair style"
+  (get (nth (get (rb-p-first "{a: 1}") :pairs) 0) :style)
+  "colon")
+
+(rb-test "hash symbol key"
+  (get (get (nth (get (rb-p-first "{a: 1}") :pairs) 0) :key) :value)
+  "a")
+
+;; ── Binary operators ──────────────────────────────────────────────────────────
+
+(rb-test "addition"
+  (rb-p-first "1 + 2")
+  {:type "binop" :op "+"
+   :left {:type "lit-int" :value 1}
+   :right {:type "lit-int" :value 2}})
+
+(rb-test "subtraction"
+  (get (rb-p-first "a - b") :op)
+  "-")
+
+(rb-test "multiplication"
+  (get (rb-p-first "x * y") :op)
+  "*")
+
+(rb-test "precedence: * before +"
+  (rb-p-first "1 + 2 * 3")
+  {:type "binop" :op "+"
+   :left {:type "lit-int" :value 1}
+   :right {:type "binop" :op "*"
+           :left {:type "lit-int" :value 2}
+           :right {:type "lit-int" :value 3}}})
+
+(rb-test "power right-assoc"
+  (rb-p-first "2 ** 3 ** 4")
+  {:type "binop" :op "**"
+   :left {:type "lit-int" :value 2}
+   :right {:type "binop" :op "**"
+           :left {:type "lit-int" :value 3}
+           :right {:type "lit-int" :value 4}}})
+
+(rb-test "equality"
+  (get (rb-p-first "a == b") :op)
+  "==")
+
+(rb-test "logical and"
+  (get (rb-p-first "a && b") :op)
+  "&&")
+
+(rb-test "logical or"
+  (get (rb-p-first "a || b") :op)
+  "||")
+
+(rb-test "range inclusive"
+  (rb-p-first "1..5")
+  {:type "range"
+   :from {:type "lit-int" :value 1}
+   :to {:type "lit-int" :value 5}
+   :exclusive false})
+
+(rb-test "range exclusive"
+  (get (rb-p-first "1...5") :exclusive)
+  true)
+
+;; ── Assignment ────────────────────────────────────────────────────────────────
+
+(rb-test "assign"
+  (rb-p-first "x = 1")
+  {:type "assign"
+   :target {:type "send" :name "x" :args (list) :block nil}
+   :value {:type "lit-int" :value 1}})
+
+(rb-test "op-assign +="
+  (get (rb-p-first "x += 1") :type)
+  "op-assign")
+
+(rb-test "op-assign op"
+  (get (rb-p-first "x += 1") :op)
+  "+")
+
+(rb-test "massign"
+  (get (rb-p-first "a, b = 1, 2") :type)
+  "massign")
+
+(rb-test "massign targets"
+  (len (get (rb-p-first "a, b = 1, 2") :targets))
+  2)
+
+(rb-test "massign value array"
+  (get (get (rb-p-first "a, b = 1, 2") :value) :type)
+  "array")
+
+;; ── Method calls ──────────────────────────────────────────────────────────────
+
+(rb-test "call with parens"
+  (rb-p-first "foo(1, 2)")
+  {:type "send" :name "foo"
+   :args (list {:type "lit-int" :value 1}
+               {:type "lit-int" :value 2})
+   :block nil})
+
+(rb-test "chained call"
+  (get (rb-p-first "obj.foo") :type)
+  "call")
+
+(rb-test "chained call method"
+  (get (rb-p-first "obj.foo") :method)
+  "foo")
+
+(rb-test "chained call with args"
+  (len (get (rb-p-first "obj.foo(1, 2)") :args))
+  2)
+
+(rb-test "no-paren call"
+  (get (rb-p-first "puts \"hello\"") :type)
+  "send")
+
+(rb-test "no-paren call name"
+  (get (rb-p-first "puts \"hello\"") :name)
+  "puts")
+
+(rb-test "no-paren call args"
+  (len (get (rb-p-first "puts \"hello\"") :args))
+  1)
+
+(rb-test "indexing"
+  (get (rb-p-first "a[0]") :type)
+  "index")
+
+;; ── Unary operators ───────────────────────────────────────────────────────────
+
+(rb-test "unary not"
+  (rb-p-first "!x")
+  {:type "unop" :op "!"
+   :value {:type "send" :name "x" :args (list) :block nil}})
+
+(rb-test "unary minus"
+  (get (rb-p-first "-x") :op)
+  "-")
+
+;; ── Method def ────────────────────────────────────────────────────────────────
+
+(rb-test "empty method def"
+  (get (rb-p-first "def foo; end") :type)
+  "method-def")
+
+(rb-test "method def name"
+  (get (rb-p-first "def foo; end") :name)
+  "foo")
+
+(rb-test "method def no params"
+  (len (get (rb-p-first "def foo; end") :params))
+  0)
+
+(rb-test "method def with params"
+  (len (get (rb-p-first "def foo(a, b); end") :params))
+  2)
+
+(rb-test "method def param-req"
+  (get (nth (get (rb-p-first "def foo(a); end") :params) 0) :type)
+  "param-req")
+
+(rb-test "method def param name"
+  (get (nth (get (rb-p-first "def foo(a); end") :params) 0) :name)
+  "a")
+
+(rb-test "method def optional param"
+  (get (nth (get (rb-p-first "def foo(a, b=1); end") :params) 1) :type)
+  "param-opt")
+
+(rb-test "method def splat"
+  (get (nth (get (rb-p-first "def foo(*args); end") :params) 0) :type)
+  "param-rest")
+
+(rb-test "method def double splat"
+  (get (nth (get (rb-p-first "def foo(**opts); end") :params) 0) :type)
+  "param-kwrest")
+
+(rb-test "method def block param"
+  (get (nth (get (rb-p-first "def foo(&blk); end") :params) 0) :type)
+  "param-block")
+
+(rb-test "method def all param types"
+  (len (get (rb-p-first "def foo(a, b=1, *c, **d, &e); end") :params))
+  5)
+
+(rb-test "method def singleton recv"
+  (get (get (rb-p-first "def self.bar; end") :recv) :type)
+  "self")
+
+(rb-test "method def body"
+  (len (get (rb-p-first "def foo; 1; 2; end") :body))
+  2)
+
+;; ── Class def ────────────────────────────────────────────────────────────────
+
+(rb-test "class def type"
+  (get (rb-p-first "class Foo; end") :type)
+  "class-def")
+
+(rb-test "class def name"
+  (get (get (rb-p-first "class Foo; end") :name) :name)
+  "Foo")
+
+(rb-test "class def no super"
+  (nil? (get (rb-p-first "class Foo; end") :super))
+  true)
+
+(rb-test "class def with super"
+  (get (get (rb-p-first "class Foo < Bar; end") :super) :name)
+  "Bar")
+
+(rb-test "singleton class"
+  (get (rb-p-first "class << self; end") :type)
+  "sclass")
+
+;; ── Module def ────────────────────────────────────────────────────────────────
+
+(rb-test "module def type"
+  (get (rb-p-first "module M; end") :type)
+  "module-def")
+
+(rb-test "module def name"
+  (get (get (rb-p-first "module M; end") :name) :name)
+  "M")
+
+;; ── Blocks ────────────────────────────────────────────────────────────────────
+
+(rb-test "block do...end"
+  (get (get (rb-p-first "foo do |x| x end") :block) :type)
+  "block")
+
+(rb-test "block brace"
+  (get (get (rb-p-first "foo { |x| x }") :block) :type)
+  "block")
+
+(rb-test "block params"
+  (len (get (get (rb-p-first "foo { |a, b| a }") :block) :params))
+  2)
+
+(rb-test "block no params"
+  (len (get (get (rb-p-first "foo { 42 }") :block) :params))
+  0)
+
+;; ── Control flow ──────────────────────────────────────────────────────────────
+
+(rb-test "return type"
+  (get (rb-p-first "return 1") :type)
+  "return")
+
+(rb-test "return value"
+  (get (get (rb-p-first "return 1") :value) :value)
+  1)
+
+(rb-test "return nil"
+  (nil? (get (rb-p-first "return") :value))
+  true)
+
+(rb-test "yield type"
+  (get (rb-p-first "yield 1") :type)
+  "yield")
+
+(rb-test "break type"
+  (get (rb-p-first "break") :type)
+  "break")
+
+(rb-test "next type"
+  (get (rb-p-first "next") :type)
+  "next")
+
+(rb-test "redo type"
+  (get (rb-p-first "redo") :type)
+  "redo")
+
+;; ── Multi-statement program ───────────────────────────────────────────────────
+
+(rb-test "two statements"
+  (len (rb-p-stmts "1\n2"))
+  2)
+
+(rb-test "semi-separated"
+  (len (rb-p-stmts "1; 2; 3"))
+  3)
+
+(rb-test "class with method"
+  (let ((cls (rb-p-first "class Foo\n  def bar\n    1\n  end\nend")))
+    (len (get cls :body)))
+  1)
+
+(list rb-test-pass rb-test-fail)

lib/ruby/tests/tokenizer.sx

@@ -0,0 +1,210 @@
+;; Ruby tokenizer tests.
+;; Final value: {:pass N :fail N :fails (list)}
+
+(define rb-deep=?
+  (fn (a b)
+    (cond
+      ((= a b) true)
+      ((and (dict? a) (dict? b))
+        (let ((ak (keys a)) (bk (keys b)))
+          (if (not (= (len ak) (len bk)))
+            false
+            (every?
+              (fn (k) (and (has-key? b k) (rb-deep=? (get a k) (get b k))))
+              ak))))
+      ((and (list? a) (list? b))
+        (if (not (= (len a) (len b)))
+          false
+          (let ((i 0) (ok true))
+            (define rb-de-loop
+              (fn ()
+                (when (and ok (< i (len a)))
+                  (do
+                    (when (not (rb-deep=? (nth a i) (nth b i)))
+                      (set! ok false))
+                    (set! i (+ i 1))
+                    (rb-de-loop)))))
+            (rb-de-loop)
+            ok)))
+      (:else false))))
+
+(define rb-test-pass 0)
+(define rb-test-fail 0)
+(define rb-test-fails (list))
+
+(define rb-test
+  (fn (name actual expected)
+    (if (rb-deep=? actual expected)
+      (set! rb-test-pass (+ rb-test-pass 1))
+      (do
+        (set! rb-test-fail (+ rb-test-fail 1))
+        (append! rb-test-fails {:name name :actual actual :expected expected})))))
+
+;; Helper: tokenize, drop newline+eof, return {:type :value} pairs
+(define rb-toks
+  (fn (src)
+    (map
+      (fn (tok) {:value (get tok "value") :type (get tok "type")})
+      (filter
+        (fn (tok)
+          (let ((ty (get tok "type")))
+            (not (or (= ty "newline") (= ty "eof")))))
+        (rb-tokenize src)))))
+
+;; Helper: get just types
+(define rb-types
+  (fn (src) (map (fn (t) (get t "type")) (rb-toks src))))
+
+;; Helper: get first token type
+(define rb-first-type
+  (fn (src) (get (get (rb-tokenize src) 0) "type")))
+
+(define rb-first-value
+  (fn (src) (get (get (rb-tokenize src) 0) "value")))
+
+;; ── 1. Keywords ────────────────────────<E29480><E29480><EFBFBD>─────────────────────────
+(rb-test "keyword def" (rb-toks "def") (list {:value "def" :type "keyword"}))
+(rb-test "keyword end" (rb-toks "end") (list {:value "end" :type "keyword"}))
+(rb-test "keyword class" (rb-toks "class") (list {:value "class" :type "keyword"}))
+(rb-test "keyword if" (rb-toks "if") (list {:value "if" :type "keyword"}))
+(rb-test "keyword while" (rb-toks "while") (list {:value "while" :type "keyword"}))
+(rb-test "keyword nil" (rb-toks "nil") (list {:value "nil" :type "keyword"}))
+(rb-test "keyword true" (rb-toks "true") (list {:value "true" :type "keyword"}))
+(rb-test "keyword false" (rb-toks "false") (list {:value "false" :type "keyword"}))
+(rb-test "keyword return" (rb-toks "return") (list {:value "return" :type "keyword"}))
+(rb-test "keyword yield" (rb-toks "yield") (list {:value "yield" :type "keyword"}))
+(rb-test "keyword begin" (rb-toks "begin") (list {:value "begin" :type "keyword"}))
+(rb-test "keyword rescue" (rb-toks "rescue") (list {:value "rescue" :type "keyword"}))
+(rb-test "keyword self" (rb-toks "self") (list {:value "self" :type "keyword"}))
+(rb-test "keyword super" (rb-toks "super") (list {:value "super" :type "keyword"}))
+
+;; ── 2. Identifiers ────────────────────────────────────────────────
+(rb-test "ident simple" (rb-toks "foo") (list {:value "foo" :type "ident"}))
+(rb-test "ident underscore" (rb-toks "_foo") (list {:value "_foo" :type "ident"}))
+(rb-test "ident with digit" (rb-toks "foo2") (list {:value "foo2" :type "ident"}))
+(rb-test "ident predicate" (rb-toks "empty?") (list {:value "empty?" :type "ident"}))
+(rb-test "ident bang" (rb-toks "save!") (list {:value "save!" :type "ident"}))
+(rb-test "defined?" (rb-toks "defined?") (list {:value "defined?" :type "keyword"}))
+
+;; ── 3. Constants ──────────────────────────────────────────────────
+(rb-test "const simple" (rb-toks "Foo") (list {:value "Foo" :type "const"}))
+(rb-test "const upcase" (rb-toks "MY_CONST") (list {:value "MY_CONST" :type "const"}))
+(rb-test "const class" (rb-toks "String") (list {:value "String" :type "const"}))
+
+;; ── 4. Sigil variables ───────────────────────────────────────────
+(rb-test "ivar" (rb-toks "@name") (list {:value "@name" :type "ivar"}))
+(rb-test "cvar" (rb-toks "@@count") (list {:value "@@count" :type "cvar"}))
+(rb-test "gvar" (rb-toks "$global") (list {:value "$global" :type "gvar"}))
+
+;; ── 5. Integers ───────────────────────────────────────────────────
+(rb-test "int decimal" (rb-first-value "42") 42)
+(rb-test "int zero" (rb-first-value "0") 0)
+(rb-test "int underscore" (rb-first-value "1_000") 1000)
+(rb-test "int hex" (rb-first-value "0xFF") 255)
+(rb-test "int hex lower" (rb-first-value "0xff") 255)
+(rb-test "int octal" (rb-first-value "0o17") 15)
+(rb-test "int binary" (rb-first-value "0b1010") 10)
+(rb-test "int type" (rb-first-type "42") "int")
+
+;; ── 6. Floats ─────────────────────────────────────────────────────
+(rb-test "float simple" (rb-first-type "3.14") "float")
+(rb-test "float value" (rb-first-value "3.14") "3.14")
+(rb-test "float exp" (rb-first-type "1.5e10") "float")
+(rb-test "float exp value" (rb-first-value "1.5e10") "1.5e10")
+
+;; ── 7. Strings ────────────────────────────────────────────────────
+(rb-test "dq string" (rb-first-value "\"hello\"") "hello")
+(rb-test "dq string type" (rb-first-type "\"hello\"") "string")
+(rb-test "sq string" (rb-first-value "'world'") "world")
+(rb-test "dq escape nl" (rb-first-value "\"a\\nb\"") "a\nb")
+(rb-test "dq escape tab" (rb-first-value "\"a\\tb\"") "a\tb")
+(rb-test "dq escape quote" (rb-first-value "\"a\\\"b\"") "a\"b")
+(rb-test "sq no escape" (rb-first-value "'a\\nb'") "a\\nb")
+(rb-test "sq escape backslash" (rb-first-value "'a\\\\'") "a\\")
+(rb-test "dq interp kept" (rb-first-value "\"#{x}\"") "#{x}")
+
+;; ── 8. Symbols ────────────────────────────────────────────────────
+(rb-test "symbol simple" (rb-first-type ":foo") "symbol")
+(rb-test "symbol value" (rb-first-value ":foo") "foo")
+(rb-test "symbol predicate" (rb-first-value ":empty?") "empty?")
+(rb-test "symbol dq" (rb-first-value ":\"hello world\"") "hello world")
+(rb-test "symbol sq" (rb-first-value ":'hello'") "hello")
+
+;; ── 9. %w and %i literals ────────────────────────────────────────
+(rb-test "%w bracket" (rb-first-type "%w[a b c]") "words")
+(rb-test "%w value" (rb-first-value "%w[a b c]") (list "a" "b" "c"))
+(rb-test "%w paren" (rb-first-value "%w(x y)") (list "x" "y"))
+(rb-test "%i bracket" (rb-first-type "%i[a b]") "isymbols")
+(rb-test "%i value" (rb-first-value "%i[foo bar]") (list "foo" "bar"))
+
+;; ── 10. Punctuation ───────────────────────────────────────────────
+(rb-test "dot" (rb-first-type ".") "dot")
+(rb-test "dotdot" (rb-first-type "..") "dotdot")
+(rb-test "dotdotdot" (rb-first-type "...") "dotdotdot")
+(rb-test "dcolon" (rb-first-type "::") "dcolon")
+(rb-test "comma" (rb-first-type ",") "comma")
+(rb-test "semi" (rb-first-type ";") "semi")
+(rb-test "lparen" (rb-first-type "(") "lparen")
+(rb-test "rparen" (rb-first-type ")") "rparen")
+(rb-test "lbracket" (rb-first-type "[") "lbracket")
+(rb-test "rbracket" (rb-first-type "]") "rbracket")
+(rb-test "lbrace" (rb-first-type "{") "lbrace")
+(rb-test "rbrace" (rb-first-type "}") "rbrace")
+(rb-test "pipe" (rb-first-type "|") "pipe")
+
+;; ── 11. Operators ─────────────────────────────────────────────────
+(rb-test "op plus" (rb-first-value "+") "+")
+(rb-test "op minus" (rb-first-value "-") "-")
+(rb-test "op star" (rb-first-value "*") "*")
+(rb-test "op slash" (rb-first-value "/") "/")
+(rb-test "op eq" (rb-first-value "=") "=")
+(rb-test "op eqeq" (rb-first-value "==") "==")
+(rb-test "op neq" (rb-first-value "!=") "!=")
+(rb-test "op lt" (rb-first-value "<") "<")
+(rb-test "op gt" (rb-first-value ">") ">")
+(rb-test "op lte" (rb-first-value "<=") "<=")
+(rb-test "op gte" (rb-first-value ">=") ">=")
+(rb-test "op spaceship" (rb-first-value "<=>") "<=>")
+(rb-test "op tripleq" (rb-first-value "===") "===")
+(rb-test "op match" (rb-first-value "=~") "=~")
+(rb-test "op nomatch" (rb-first-value "!~") "!~")
+(rb-test "op lshift" (rb-first-value "<<") "<<")
+(rb-test "op rshift" (rb-first-value ">>") ">>")
+(rb-test "op and" (rb-first-value "&&") "&&")
+(rb-test "op or" (rb-first-value "||") "||")
+(rb-test "op power" (rb-first-value "**") "**")
+(rb-test "op plus-eq" (rb-first-value "+=") "+=")
+(rb-test "op minus-eq" (rb-first-value "-=") "-=")
+(rb-test "op arrow" (rb-first-value "->") "->")
+(rb-test "op hash-rocket" (rb-first-value "=>") "=>")
+
+;; ── 12. Comments ──────────────────────────────────────────────────
+(rb-test "comment skipped" (len (rb-toks "# this is a comment")) 0)
+(rb-test "comment mid-line" (rb-types "x = 1 # comment") (list "ident" "op" "int"))
+
+;; ── 13. Multi-token sequences ─────────────────────────────────────
+(rb-test "method call" (rb-types "foo.bar")
+  (list "ident" "dot" "ident"))
+(rb-test "class def" (rb-types "class Foo")
+  (list "keyword" "const"))
+(rb-test "method def" (rb-types "def greet(name)")
+  (list "keyword" "ident" "lparen" "ident" "rparen"))
+(rb-test "assignment" (rb-types "x = 42")
+  (list "ident" "op" "int"))
+(rb-test "block params" (rb-types "|x, y|")
+  (list "pipe" "ident" "comma" "ident" "pipe"))
+(rb-test "scope resolution" (rb-types "Foo::Bar")
+  (list "const" "dcolon" "const"))
+(rb-test "range" (rb-types "1..10")
+  (list "int" "dotdot" "int"))
+(rb-test "exclusive range" (rb-types "1...10")
+  (list "int" "dotdotdot" "int"))
+
+;; ── 14. Line/col tracking ────────────────────────────────────────
+(define rb-tok1 (get (rb-tokenize "hello\nworld") 0))
+(define rb-tok2 (get (rb-tokenize "hello\nworld") 2))
+(rb-test "line track start" (get rb-tok1 "line") 1)
+(rb-test "line track second" (get rb-tok2 "line") 2)
+(rb-test "col track start" (get rb-tok1 "col") 1)
+
+(list rb-test-pass rb-test-fail)

lib/ruby/tokenizer.sx

@@ -0,0 +1,549 @@
+;; Ruby tokenizer for Ruby 2.7 subset.
+;; Token: {:type T :value V :line L :col C}
+;;
+;; Types: keyword ident ivar cvar gvar const
+;;        int float string symbol
+;;        op dot dotdot dotdotdot dcolon colon
+;;        lparen rparen lbracket rbracket lbrace rbrace
+;;        comma semi pipe newline words isymbols eof
+
+;; ── Character code table ──────────────────────────────────────────
+(define rb-ord-table
+  (let ((t (dict)) (i 0))
+    (define rb-build-table
+      (fn ()
+        (when (< i 128)
+          (do
+            (dict-set! t (char-from-code i) i)
+            (set! i (+ i 1))
+            (rb-build-table)))))
+    (rb-build-table)
+    t))
+
+(define rb-ord (fn (c) (or (get rb-ord-table c) 0)))
+
+;; ── Character predicates ──────────────────────────────────────────
+(define rb-digit?
+  (fn (c) (and (string? c) (>= (rb-ord c) 48) (<= (rb-ord c) 57))))
+
+(define rb-hex-digit?
+  (fn (c)
+    (and (string? c)
+         (or (and (>= (rb-ord c) 48) (<= (rb-ord c) 57))
+             (and (>= (rb-ord c) 97) (<= (rb-ord c) 102))
+             (and (>= (rb-ord c) 65) (<= (rb-ord c) 70))))))
+
+(define rb-octal-digit?
+  (fn (c) (and (string? c) (>= (rb-ord c) 48) (<= (rb-ord c) 55))))
+
+(define rb-binary-digit? (fn (c) (or (= c "0") (= c "1"))))
+
+(define rb-lower?
+  (fn (c) (and (string? c) (>= (rb-ord c) 97) (<= (rb-ord c) 122))))
+
+(define rb-upper?
+  (fn (c) (and (string? c) (>= (rb-ord c) 65) (<= (rb-ord c) 90))))
+
+(define rb-ident-start?
+  (fn (c) (or (rb-lower? c) (rb-upper? c) (= c "_"))))
+
+(define rb-ident-cont?
+  (fn (c) (or (rb-lower? c) (rb-upper? c) (rb-digit? c) (= c "_"))))
+
+(define rb-space? (fn (c) (or (= c " ") (= c "\t") (= c "\r"))))
+
+;; ── Reserved words ────────────────────────────────────────────────
+(define rb-keywords
+  (list "__ENCODING__" "__LINE__" "__FILE__"
+        "BEGIN" "END"
+        "alias" "and"
+        "begin" "break"
+        "case" "class"
+        "def" "defined?" "do"
+        "else" "elsif" "end" "ensure"
+        "false" "for"
+        "if" "in"
+        "module"
+        "next" "nil" "not"
+        "or"
+        "redo" "rescue" "retry" "return"
+        "self" "super"
+        "then" "true"
+        "undef" "unless" "until"
+        "when" "while"
+        "yield"))
+
+(define rb-keyword? (fn (w) (contains? rb-keywords w)))
+
+;; ── Token constructor ─────────────────────────────────────────────
+(define rb-make-token
+  (fn (type value line col) {:type type :value value :line line :col col}))
+
+;; ── Radix number parser ───────────────────────────────────────────
+(define rb-parse-radix
+  (fn (s radix)
+    (let ((n (len s)) (i 0) (acc 0))
+      (define rb-rad-loop
+        (fn ()
+          (when (< i n)
+            (do
+              (let ((c (substring s i (+ i 1))))
+                (cond
+                  ((and (>= (rb-ord c) 48) (<= (rb-ord c) 57))
+                    (set! acc (+ (* acc radix) (- (rb-ord c) 48))))
+                  ((and (>= (rb-ord c) 97) (<= (rb-ord c) 102))
+                    (set! acc (+ (* acc radix) (+ 10 (- (rb-ord c) 97)))))
+                  ((and (>= (rb-ord c) 65) (<= (rb-ord c) 70))
+                    (set! acc (+ (* acc radix) (+ 10 (- (rb-ord c) 65)))))))
+              (set! i (+ i 1))
+              (rb-rad-loop)))))
+      (rb-rad-loop)
+      acc)))
+
+;; ── Strip underscores from numeric literals ───────────────────────
+(define rb-strip-underscores
+  (fn (s)
+    (let ((n (len s)) (i 0) (parts (list)))
+      (define rb-su-loop
+        (fn ()
+          (when (< i n)
+            (do
+              (let ((c (substring s i (+ i 1))))
+                (when (not (= c "_"))
+                  (append! parts c)))
+              (set! i (+ i 1))
+              (rb-su-loop)))))
+      (rb-su-loop)
+      (join "" parts))))
+
+;; ── Main tokenizer ────────────────────────────────────────────────
+(define rb-tokenize
+  (fn (src)
+    (let ((tokens (list))
+          (pos 0)
+          (line 1)
+          (col 1)
+          (src-len (len src)))
+      (define rb-peek
+        (fn (offset)
+          (if (< (+ pos offset) src-len)
+            (substring src (+ pos offset) (+ pos offset 1))
+            nil)))
+      (define rb-cur (fn () (rb-peek 0)))
+      (define rb-advance!
+        (fn ()
+          (let ((c (rb-cur)))
+            (set! pos (+ pos 1))
+            (if (= c "\n")
+              (do (set! line (+ line 1)) (set! col 1))
+              (set! col (+ col 1))))))
+      (define rb-advance-n!
+        (fn (n)
+          (when (> n 0)
+            (do (rb-advance!) (rb-advance-n! (- n 1))))))
+      (define rb-push!
+        (fn (type value tok-line tok-col)
+          (append! tokens (rb-make-token type value tok-line tok-col))))
+      (define rb-read-while
+        (fn (pred)
+          (let ((start pos))
+            (define rb-rw-loop
+              (fn ()
+                (when (and (< pos src-len) (pred (rb-cur)))
+                  (do (rb-advance!) (rb-rw-loop)))))
+            (rb-rw-loop)
+            (substring src start pos))))
+      (define rb-skip-line-comment!
+        (fn ()
+          (define rb-slc-loop
+            (fn ()
+              (when (and (< pos src-len) (not (= (rb-cur) "\n")))
+                (do (rb-advance!) (rb-slc-loop)))))
+          (rb-slc-loop)))
+      (define rb-read-escape
+        (fn ()
+          (rb-advance!)
+          (let ((c (rb-cur)))
+            (cond
+              ((= c "n") (do (rb-advance!) "\n"))
+              ((= c "t") (do (rb-advance!) "\t"))
+              ((= c "r") (do (rb-advance!) "\r"))
+              ((= c "\\") (do (rb-advance!) "\\"))
+              ((= c "'") (do (rb-advance!) "'"))
+              ((= c "\"") (do (rb-advance!) "\""))
+              ((= c "a") (do (rb-advance!) (char-from-code 7)))
+              ((= c "b") (do (rb-advance!) (char-from-code 8)))
+              ((= c "f") (do (rb-advance!) (char-from-code 12)))
+              ((= c "v") (do (rb-advance!) (char-from-code 11)))
+              ((= c "e") (do (rb-advance!) (char-from-code 27)))
+              ((= c "s") (do (rb-advance!) " "))
+              ((= c "0") (do (rb-advance!) (char-from-code 0)))
+              (:else (do (rb-advance!) (str "\\" c)))))))
+      (define rb-read-sq-string
+        (fn ()
+          (let ((parts (list)))
+            (rb-advance!)
+            (define rb-sq-loop
+              (fn ()
+                (cond
+                  ((>= pos src-len) nil)
+                  ((= (rb-cur) "'") (rb-advance!))
+                  ((and (= (rb-cur) "\\")
+                        (let ((n (rb-peek 1)))
+                          (or (= n "\\") (= n "'"))))
+                    (do
+                      (rb-advance!)
+                      (append! parts (rb-cur))
+                      (rb-advance!)
+                      (rb-sq-loop)))
+                  (:else
+                    (do
+                      (append! parts (rb-cur))
+                      (rb-advance!)
+                      (rb-sq-loop))))))
+            (rb-sq-loop)
+            (join "" parts))))
+      (define rb-read-dq-string
+        (fn ()
+          (let ((parts (list)))
+            (rb-advance!)
+            (define rb-dq-loop
+              (fn ()
+                (cond
+                  ((>= pos src-len) nil)
+                  ((= (rb-cur) "\"") (rb-advance!))
+                  ((= (rb-cur) "\\")
+                    (do
+                      (append! parts (rb-read-escape))
+                      (rb-dq-loop)))
+                  ((and (= (rb-cur) "#") (= (rb-peek 1) "{"))
+                    (do
+                      (append! parts "#{")
+                      (rb-advance-n! 2)
+                      (let ((depth 1))
+                        (define rb-interp-inner
+                          (fn ()
+                            (when (and (< pos src-len) (> depth 0))
+                              (do
+                                (let ((c (rb-cur)))
+                                  (cond
+                                    ((= c "{")
+                                      (do
+                                        (set! depth (+ depth 1))
+                                        (append! parts c)
+                                        (rb-advance!)))
+                                    ((= c "}")
+                                      (do
+                                        (set! depth (- depth 1))
+                                        (when (> depth 0)
+                                          (do (append! parts c) (rb-advance!)))))
+                                    (:else
+                                      (do (append! parts c) (rb-advance!)))))
+                                (rb-interp-inner)))))
+                        (rb-interp-inner))
+                      (when (= (rb-cur) "}")
+                        (do (append! parts "}") (rb-advance!)))
+                      (rb-dq-loop)))
+                  (:else
+                    (do
+                      (append! parts (rb-cur))
+                      (rb-advance!)
+                      (rb-dq-loop))))))
+            (rb-dq-loop)
+            (join "" parts))))
+      (define rb-read-percent-words
+        (fn ()
+          (rb-advance-n! 2)
+          (let ((open-ch (rb-cur)))
+            (let ((close-ch
+                    (cond
+                      ((= open-ch "[") "]")
+                      ((= open-ch "(") ")")
+                      ((= open-ch "{") "}")
+                      ((= open-ch "<") ">")
+                      (:else open-ch))))
+              (rb-advance!)
+              (let ((items (list)))
+                (define rb-pw-skip
+                  (fn ()
+                    (when (and (< pos src-len) (or (rb-space? (rb-cur)) (= (rb-cur) "\n")))
+                      (do (rb-advance!) (rb-pw-skip)))))
+                (define rb-pw-word
+                  (fn (wparts)
+                    (if (or (>= pos src-len)
+                             (rb-space? (rb-cur))
+                             (= (rb-cur) "\n")
+                             (= (rb-cur) close-ch))
+                      (append! items (join "" wparts))
+                      (do
+                        (append! wparts (rb-cur))
+                        (rb-advance!)
+                        (rb-pw-word wparts)))))
+                (define rb-pw-loop
+                  (fn ()
+                    (rb-pw-skip)
+                    (when (and (< pos src-len) (not (= (rb-cur) close-ch)))
+                      (do
+                        (rb-pw-word (list))
+                        (rb-pw-loop)))))
+                (rb-pw-loop)
+                (when (= (rb-cur) close-ch) (rb-advance!))
+                items)))))
+      (define rb-read-ident-word
+        (fn ()
+          (let ((start pos))
+            (rb-read-while rb-ident-cont?)
+            (when (and (= (rb-cur) "?") (not (= (rb-peek 1) "=")))
+              (rb-advance!))
+            (when (and (= (rb-cur) "!") (not (or (= (rb-peek 1) "=") (= (rb-peek 1) "~"))))
+              (rb-advance!))
+            (substring src start pos))))
+      (define rb-read-number!
+        (fn (tok-line tok-col)
+          (let ((start pos))
+            (cond
+              ((and (= (rb-cur) "0") (let ((p (rb-peek 1))) (or (= p "b") (= p "B"))))
+                (do
+                  (rb-advance-n! 2)
+                  (let ((bin-str (rb-read-while rb-binary-digit?)))
+                    (rb-push! "int" (rb-parse-radix bin-str 2) tok-line tok-col))))
+              ((and (= (rb-cur) "0") (let ((p (rb-peek 1))) (or (= p "o") (= p "O"))))
+                (do
+                  (rb-advance-n! 2)
+                  (let ((oct-str (rb-read-while rb-octal-digit?)))
+                    (rb-push! "int" (rb-parse-radix oct-str 8) tok-line tok-col))))
+              ((and (= (rb-cur) "0") (let ((p (rb-peek 1))) (or (= p "x") (= p "X"))))
+                (do
+                  (rb-advance-n! 2)
+                  (let ((hex-str (rb-read-while rb-hex-digit?)))
+                    (rb-push! "int" (rb-parse-radix hex-str 16) tok-line tok-col))))
+              (:else
+                (do
+                  (rb-read-while (fn (c) (or (rb-digit? c) (= c "_"))))
+                  (let ((is-float false))
+                    (when (and (= (rb-cur) ".") (rb-digit? (rb-peek 1)))
+                      (do
+                        (set! is-float true)
+                        (rb-advance!)
+                        (rb-read-while (fn (c) (or (rb-digit? c) (= c "_"))))))
+                    (when (or (= (rb-cur) "e") (= (rb-cur) "E"))
+                      (do
+                        (set! is-float true)
+                        (rb-advance!)
+                        (when (or (= (rb-cur) "+") (= (rb-cur) "-"))
+                          (rb-advance!))
+                        (rb-read-while rb-digit?)))
+                    (let ((num-str (rb-strip-underscores (substring src start pos))))
+                      (if is-float
+                        (rb-push! "float" num-str tok-line tok-col)
+                        (rb-push! "int" (parse-int num-str) tok-line tok-col))))))))))
+      (define rb-read-op!
+        (fn (tok-line tok-col)
+          (let ((c0 (rb-cur)) (c1 (rb-peek 1)) (c2 (rb-peek 2)))
+            (cond
+              ((and (= c0 "<") (= c1 "=") (= c2 ">"))
+                (do (rb-advance-n! 3) (rb-push! "op" "<=>" tok-line tok-col)))
+              ((and (= c0 "=") (= c1 "=") (= c2 "="))
+                (do (rb-advance-n! 3) (rb-push! "op" "===" tok-line tok-col)))
+              ((and (= c0 "*") (= c1 "*") (= c2 "="))
+                (do (rb-advance-n! 3) (rb-push! "op" "**=" tok-line tok-col)))
+              ((and (= c0 "<") (= c1 "<") (= c2 "="))
+                (do (rb-advance-n! 3) (rb-push! "op" "<<=" tok-line tok-col)))
+              ((and (= c0 ">") (= c1 ">") (= c2 "="))
+                (do (rb-advance-n! 3) (rb-push! "op" ">>=" tok-line tok-col)))
+              ((and (= c0 "&") (= c1 "&") (= c2 "="))
+                (do (rb-advance-n! 3) (rb-push! "op" "&&=" tok-line tok-col)))
+              ((and (= c0 "|") (= c1 "|") (= c2 "="))
+                (do (rb-advance-n! 3) (rb-push! "op" "||=" tok-line tok-col)))
+              ((and (= c0 "*") (= c1 "*"))
+                (do (rb-advance-n! 2) (rb-push! "op" "**" tok-line tok-col)))
+              ((and (= c0 "=") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "==" tok-line tok-col)))
+              ((and (= c0 "!") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "!=" tok-line tok-col)))
+              ((and (= c0 "<") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "<=" tok-line tok-col)))
+              ((and (= c0 ">") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" ">=" tok-line tok-col)))
+              ((and (= c0 "=") (= c1 "~"))
+                (do (rb-advance-n! 2) (rb-push! "op" "=~" tok-line tok-col)))
+              ((and (= c0 "!") (= c1 "~"))
+                (do (rb-advance-n! 2) (rb-push! "op" "!~" tok-line tok-col)))
+              ((and (= c0 "<") (= c1 "<"))
+                (do (rb-advance-n! 2) (rb-push! "op" "<<" tok-line tok-col)))
+              ((and (= c0 ">") (= c1 ">"))
+                (do (rb-advance-n! 2) (rb-push! "op" ">>" tok-line tok-col)))
+              ((and (= c0 "&") (= c1 "&"))
+                (do (rb-advance-n! 2) (rb-push! "op" "&&" tok-line tok-col)))
+              ((and (= c0 "|") (= c1 "|"))
+                (do (rb-advance-n! 2) (rb-push! "op" "||" tok-line tok-col)))
+              ((and (= c0 "+") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "+=" tok-line tok-col)))
+              ((and (= c0 "-") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "-=" tok-line tok-col)))
+              ((and (= c0 "*") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "*=" tok-line tok-col)))
+              ((and (= c0 "/") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "/=" tok-line tok-col)))
+              ((and (= c0 "%") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "%=" tok-line tok-col)))
+              ((and (= c0 "&") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "&=" tok-line tok-col)))
+              ((and (= c0 "|") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "|=" tok-line tok-col)))
+              ((and (= c0 "^") (= c1 "="))
+                (do (rb-advance-n! 2) (rb-push! "op" "^=" tok-line tok-col)))
+              ((and (= c0 "-") (= c1 ">"))
+                (do (rb-advance-n! 2) (rb-push! "op" "->" tok-line tok-col)))
+              ((and (= c0 "=") (= c1 ">"))
+                (do (rb-advance-n! 2) (rb-push! "op" "=>" tok-line tok-col)))
+              ((and (= c0 "|") (nil? c1))
+                (do (rb-advance!) (rb-push! "pipe" "|" tok-line tok-col)))
+              ((= c0 "|")
+                (do (rb-advance!) (rb-push! "pipe" "|" tok-line tok-col)))
+              (:else
+                (do (rb-advance!) (rb-push! "op" c0 tok-line tok-col)))))))
+      (define rb-scan!
+        (fn ()
+          (cond
+            ((>= pos src-len) nil)
+            ((rb-space? (rb-cur)) (do (rb-advance!) (rb-scan!)))
+            ((= (rb-cur) "#") (do (rb-skip-line-comment!) (rb-scan!)))
+            ((= (rb-cur) "\n")
+              (do
+                (let ((l line) (c col))
+                  (rb-advance!)
+                  (rb-push! "newline" nil l c))
+                (rb-scan!)))
+            ((rb-digit? (rb-cur))
+              (do
+                (let ((l line) (c col))
+                  (rb-read-number! l c))
+                (rb-scan!)))
+            ((rb-ident-start? (rb-cur))
+              (do
+                (let ((l line) (c col))
+                  (let ((w (rb-read-ident-word)))
+                    (if (rb-keyword? w)
+                      (rb-push! "keyword" w l c)
+                      (if (rb-upper? (substring w 0 1))
+                        (rb-push! "const" w l c)
+                        (rb-push! "ident" w l c)))))
+                (rb-scan!)))
+            ((= (rb-cur) "@")
+              (do
+                (let ((l line) (c col))
+                  (if (= (rb-peek 1) "@")
+                    (do
+                      (rb-advance-n! 2)
+                      (let ((name (rb-read-while rb-ident-cont?)))
+                        (rb-push! "cvar" (str "@@" name) l c)))
+                    (do
+                      (rb-advance!)
+                      (let ((name (rb-read-while rb-ident-cont?)))
+                        (rb-push! "ivar" (str "@" name) l c)))))
+                (rb-scan!)))
+            ((= (rb-cur) "$")
+              (do
+                (let ((l line) (c col))
+                  (rb-advance!)
+                  (let ((name (rb-read-while rb-ident-cont?)))
+                    (rb-push! "gvar" (str "$" name) l c)))
+                (rb-scan!)))
+            ((= (rb-cur) "\"")
+              (do
+                (let ((l line) (c col))
+                  (rb-push! "string" (rb-read-dq-string) l c))
+                (rb-scan!)))
+            ((= (rb-cur) "'")
+              (do
+                (let ((l line) (c col))
+                  (rb-push! "string" (rb-read-sq-string) l c))
+                (rb-scan!)))
+            ((and (= (rb-cur) ":") (= (rb-peek 1) ":"))
+              (do
+                (let ((l line) (c col))
+                  (rb-advance-n! 2)
+                  (rb-push! "dcolon" "::" l c))
+                (rb-scan!)))
+            ((= (rb-cur) ":")
+              (do
+                (let ((l line) (c col))
+                  (rb-advance!)
+                  (cond
+                    ((= (rb-cur) "\"")
+                      (rb-push! "symbol" (rb-read-dq-string) l c))
+                    ((= (rb-cur) "'")
+                      (rb-push! "symbol" (rb-read-sq-string) l c))
+                    ((rb-ident-start? (rb-cur))
+                      (let ((name (rb-read-ident-word)))
+                        (rb-push! "symbol" name l c)))
+                    (:else
+                      (rb-push! "colon" ":" l c))))
+                (rb-scan!)))
+            ((and (= (rb-cur) "%")
+                  (let ((p (rb-peek 1)))
+                    (or (= p "w") (= p "W") (= p "i") (= p "I"))))
+              (do
+                (let ((l line) (c col))
+                  (let ((kind (rb-peek 1)))
+                    (let ((items (rb-read-percent-words)))
+                      (if (or (= kind "i") (= kind "I"))
+                        (rb-push! "isymbols" items l c)
+                        (rb-push! "words" items l c)))))
+                (rb-scan!)))
+            ((= (rb-cur) ".")
+              (do
+                (let ((l line) (c col))
+                  (cond
+                    ((and (= (rb-peek 1) ".") (= (rb-peek 2) "."))
+                      (do (rb-advance-n! 3) (rb-push! "dotdotdot" "..." l c)))
+                    ((= (rb-peek 1) ".")
+                      (do (rb-advance-n! 2) (rb-push! "dotdot" ".." l c)))
+                    (:else
+                      (do (rb-advance!) (rb-push! "dot" "." l c)))))
+                (rb-scan!)))
+            ((= (rb-cur) ",")
+              (do
+                (let ((l line) (c col)) (rb-push! "comma" "," l c) (rb-advance!))
+                (rb-scan!)))
+            ((= (rb-cur) ";")
+              (do
+                (let ((l line) (c col)) (rb-push! "semi" ";" l c) (rb-advance!))
+                (rb-scan!)))
+            ((= (rb-cur) "(")
+              (do
+                (let ((l line) (c col)) (rb-push! "lparen" "(" l c) (rb-advance!))
+                (rb-scan!)))
+            ((= (rb-cur) ")")
+              (do
+                (let ((l line) (c col)) (rb-push! "rparen" ")" l c) (rb-advance!))
+                (rb-scan!)))
+            ((= (rb-cur) "[")
+              (do
+                (let ((l line) (c col)) (rb-push! "lbracket" "[" l c) (rb-advance!))
+                (rb-scan!)))
+            ((= (rb-cur) "]")
+              (do
+                (let ((l line) (c col)) (rb-push! "rbracket" "]" l c) (rb-advance!))
+                (rb-scan!)))
+            ((= (rb-cur) "{")
+              (do
+                (let ((l line) (c col)) (rb-push! "lbrace" "{" l c) (rb-advance!))
+                (rb-scan!)))
+            ((= (rb-cur) "}")
+              (do
+                (let ((l line) (c col)) (rb-push! "rbrace" "}" l c) (rb-advance!))
+                (rb-scan!)))
+            ((or (= (rb-cur) "+") (= (rb-cur) "-") (= (rb-cur) "*")
+                 (= (rb-cur) "/") (= (rb-cur) "%") (= (rb-cur) "=")
+                 (= (rb-cur) "!") (= (rb-cur) "<") (= (rb-cur) ">")
+                 (= (rb-cur) "&") (= (rb-cur) "^") (= (rb-cur) "~")
+                 (= (rb-cur) "|"))
+              (do
+                (let ((l line) (c col)) (rb-read-op! l c))
+                (rb-scan!)))
+            (:else (do (rb-advance!) (rb-scan!))))))
+      (rb-scan!)
+      (rb-push! "eof" nil line col)
+      tokens)))

plans/agent-briefings/apl-loop.md

@@ -0,0 +1,81 @@
+# apl-on-sx loop agent (single agent, queue-driven)
+
+Role: iterates `plans/apl-on-sx.md` forever. Rank-polymorphic primitives + 6 operators on the JIT is the headline showcase — APL is the densest combinator algebra you can put on top of a primitive table. Every program is `array → array` pure pipelines, exactly what the JIT was built for.
+
+```
+description: apl-on-sx queue loop
+subagent_type: general-purpose
+run_in_background: true
+isolation: worktree
+```
+
+## Prompt
+
+You are the sole background agent working `/root/rose-ash/plans/apl-on-sx.md`. Isolated worktree, forever, one commit per feature. Never push.
+
+## Restart baseline — check before iterating
+
+1. Read `plans/apl-on-sx.md` — roadmap + Progress log.
+2. `ls lib/apl/` — pick up from the most advanced file.
+3. If `lib/apl/tests/*.sx` exist, run them. Green before new work.
+4. If `lib/apl/scoreboard.md` exists, that's your baseline.
+
+## The queue
+
+Phase order per `plans/apl-on-sx.md`:
+
+- **Phase 1** — tokenizer + parser. Unicode glyphs, `¯` for negative, strands (juxtaposition), right-to-left, valence resolution by syntactic position
+- **Phase 2** — array model + scalar primitives. `make-array {shape, ravel}`, scalar promotion, broadcast for `+ - × ÷ ⌈ ⌊ * ⍟ | ! ○`, comparison, logical, `⍳`, `⎕IO`
+- **Phase 3** — structural primitives + indexing. `⍴ , ⍉ ↑ ↓ ⌽ ⊖ ⌷ ⍋ ⍒ ⊂ ⊃ ∊`
+- **Phase 4** — **THE SHOWCASE**: operators. `f/` (reduce), `f¨` (each), `∘.f` (outer), `f.g` (inner), `f⍨` (commute), `f∘g` (compose), `f⍣n` (power), `f⍤k` (rank), `@` (at)
+- **Phase 5** — dfns + tradfns + control flow. `{⍺+⍵}`, `∇` recurse, `⍺←default`, tradfn header, `:If/:While/:For/:Select`
+- **Phase 6** — classic programs (life, mandelbrot, primes, n-queens, quicksort) + idiom corpus + drive to 100+
+
+Within a phase, pick the checkbox that unlocks the most tests per effort.
+
+Every iteration: implement → test → commit → tick `[ ]` → Progress log → next.
+
+## Ground rules (hard)
+
+- **Scope:** only `lib/apl/**` and `plans/apl-on-sx.md`. Do **not** edit `spec/`, `hosts/`, `shared/`, other `lib/<lang>/` dirs, `lib/stdlib.sx`, or `lib/` root. APL primitives go in `lib/apl/runtime.sx`.
+- **NEVER call `sx_build`.** 600s watchdog. If sx_server binary broken → Blockers entry, stop.
+- **Shared-file issues** → plan's Blockers with minimal repro.
+- **SX files:** `sx-tree` MCP tools ONLY. `sx_validate` after edits.
+- **Unicode in `.sx`:** raw UTF-8 only, never `\uXXXX` escapes. Glyphs land directly in source.
+- **Worktree:** commit locally. Never push. Never touch `main`.
+- **Commit granularity:** one feature per commit.
+- **Plan file:** update Progress log + tick boxes every commit.
+
+## APL-specific gotchas
+
+- **Right-to-left, no precedence among functions.** `2 × 3 + 4` is `2 × (3 + 4)` = 14, not 10. Operators bind tighter than functions: `+/ ⍳5` is `+/(⍳5)`, and `2 +.× 3 4` is `2 (+.×) 3 4`.
+- **Valence by position.** `-3` is monadic negate (`-` with no left arg). `5-3` is dyadic subtract. The parser must look left to decide. Same glyph; different fn.
+- **`¯` is part of a number literal**, not a prefix function. `¯3` is the literal negative three; `-3` is the function call. Tokenizer eats `¯` into the numeric token.
+- **Strands.** `1 2 3` is a 3-element vector, not three separate calls. Adjacent literals fuse into a strand at parse time. Adjacent names do *not* fuse — `a b c` is three separate references.
+- **Scalar promotion.** `1 + 2 3 4` ↦ `3 4 5`. Any scalar broadcasts against any-rank conformable shape.
+- **Conformability** = exactly matching shapes, OR one side scalar, OR (in some dialects) one side rank-1 cycling against rank-N. Keep strict in v1: matching shape or scalar only.
+- **`⍳` is overloaded.** Monadic `⍳N` = vector 1..N (or 0..N-1 if `⎕IO=0`). Dyadic `V ⍳ W` = first-index lookup, returns `≢V+1` for not-found.
+- **Reduce with `+/⍳0`** = `0` (identity for `+`). Each scalar primitive has a defined identity used by reduce-on-empty. Don't crash; return identity.
+- **Reduce direction.** `f/` reduces the *last* axis. `f⌿` reduces the *first*. Matters for matrices.
+- **Indexing is 1-based** by default (`⎕IO=1`). Do not silently translate to 0-based; respect `⎕IO`.
+- **Bracket indexing** `A[I]` is sugar for `I⌷A` (squad-quad). Multi-axis: `A[I;J]` is `I J⌷A` with semicolon-separated axes; `A[;J]` selects all of axis 0.
+- **Dfn `{...}`** — `⍺` = left arg (may be unbound for monadic call → check with `⍺←default`), `⍵` = right arg, `∇` = recurse. Default left arg syntax: `⍺←0`.
+- **Tradfn vs dfn** — tradfns use line-numbered `→linenum` for goto; dfns use guards `cond:expr`. Pick the right one for the user's syntax.
+- **Empty array** = rank-N array where some dim is 0. `0⍴⍳0` is empty rank-1. Scalar prototype matters for empty-array operations; ignore in v1, return 0/space.
+- **Test corpus:** custom + idioms. Place programs in `lib/apl/tests/programs/` with `.apl` extension.
+
+## General gotchas (all loops)
+
+- SX `do` = R7RS iteration. Use `begin` for multi-expr sequences.
+- `cond`/`when`/`let` clauses evaluate only the last expr.
+- `type-of` on user fn returns `"lambda"`.
+- Shell heredoc `||` gets eaten — escape or use `case`.
+
+## Style
+
+- No comments in `.sx` unless non-obvious.
+- No new planning docs — update `plans/apl-on-sx.md` inline.
+- Short, factual commit messages (`apl: outer product ∘. (+9)`).
+- One feature per iteration. Commit. Log. Next.
+
+Go. Read the plan; find first `[ ]`; implement.

plans/agent-briefings/common-lisp-loop.md

@@ -0,0 +1,80 @@
+# common-lisp-on-sx loop agent (single agent, queue-driven)
+
+Role: iterates `plans/common-lisp-on-sx.md` forever. Conditions + restarts on delimited continuations is the headline showcase — every other Lisp reinvents resumable exceptions on the host stack. On SX `signal`/`invoke-restart` is just a captured continuation. Plus CLOS, the LOOP macro, packages.
+
+```
+description: common-lisp-on-sx queue loop
+subagent_type: general-purpose
+run_in_background: true
+isolation: worktree
+```
+
+## Prompt
+
+You are the sole background agent working `/root/rose-ash/plans/common-lisp-on-sx.md`. Isolated worktree, forever, one commit per feature. Never push.
+
+## Restart baseline — check before iterating
+
+1. Read `plans/common-lisp-on-sx.md` — roadmap + Progress log.
+2. `ls lib/common-lisp/` — pick up from the most advanced file.
+3. If `lib/common-lisp/tests/*.sx` exist, run them. Green before new work.
+4. If `lib/common-lisp/scoreboard.md` exists, that's your baseline.
+
+## The queue
+
+Phase order per `plans/common-lisp-on-sx.md`:
+
+- **Phase 1** — reader + parser (read macros `#'` `'` `` ` `` `,` `,@` `#( … )` `#:` `#\char` `#xFF` `#b1010`, ratios, dispatch chars, lambda lists with `&optional`/`&rest`/`&key`/`&aux`)
+- **Phase 2** — sequential eval + special forms (`let`/`let*`/`flet`/`labels`, `block`/`return-from`, `tagbody`/`go`, `unwind-protect`, multiple values, `setf` subset, dynamic variables)
+- **Phase 3** — **THE SHOWCASE**: condition system + restarts. `define-condition`, `signal`/`error`/`cerror`/`warn`, `handler-bind` (non-unwinding), `handler-case` (unwinding), `restart-case`, `restart-bind`, `find-restart`/`invoke-restart`/`compute-restarts`, `with-condition-restarts`. Classic programs (restart-demo, parse-recover, interactive-debugger) green.
+- **Phase 4** — CLOS: `defclass`, `defgeneric`, `defmethod` with `:before`/`:after`/`:around`, `call-next-method`, multiple dispatch
+- **Phase 5** — macros + LOOP macro + reader macros
+- **Phase 6** — packages + stdlib (sequence functions, FORMAT directives, drive corpus to 200+)
+
+Within a phase, pick the checkbox that unlocks the most tests per effort.
+
+Every iteration: implement → test → commit → tick `[ ]` → Progress log → next.
+
+## Ground rules (hard)
+
+- **Scope:** only `lib/common-lisp/**` and `plans/common-lisp-on-sx.md`. Do **not** edit `spec/`, `hosts/`, `shared/`, other `lib/<lang>/` dirs, `lib/stdlib.sx`, or `lib/` root. CL primitives go in `lib/common-lisp/runtime.sx`.
+- **NEVER call `sx_build`.** 600s watchdog. If sx_server binary broken → Blockers entry, stop.
+- **Shared-file issues** → plan's Blockers with minimal repro.
+- **Delimited continuations** are in `lib/callcc.sx` + `spec/evaluator.sx` Step 5. `sx_summarise` spec/evaluator.sx first — 2300+ lines.
+- **SX files:** `sx-tree` MCP tools ONLY. `sx_validate` after edits.
+- **Worktree:** commit locally. Never push. Never touch `main`.
+- **Commit granularity:** one feature per commit.
+- **Plan file:** update Progress log + tick boxes every commit.
+
+## Common-Lisp-specific gotchas
+
+- **`handler-bind` is non-unwinding** — handlers can decline by returning normally, in which case `signal` keeps walking the chain. **`handler-case` is unwinding** — picking a handler aborts the protected form via a captured continuation. Don't conflate them.
+- **Restarts are not handlers.** `restart-case` establishes named *resumption points*; `signal` runs handler code with restarts visible; the handler chooses a restart by calling `invoke-restart`, which abandons handler stack and resumes at the restart point. Two stacks: handlers walk down, restarts wait to be invoked.
+- **`block` / `return-from`** is lexical. `block name … (return-from name v) …` captures `^k` once at entry; `return-from` invokes it. `return-from` to a name not in scope is an error (don't fall back to outer block).
+- **`tagbody` / `go`** — each tag in tagbody is a continuation; `go tag` invokes it. Tags are lexical, can only target tagbodies in scope.
+- **`unwind-protect`** runs cleanup on *any* non-local exit (return-from, throw, condition unwind). Implement as a scope frame fired by the cleanup machinery.
+- **Multiple values**: primary-value-only contexts (function args, `if` test, etc.) drop extras silently. `values` produces multiple. `multiple-value-bind` / `multiple-value-call` consume them. Don't auto-list.
+- **CLOS dispatch:** sort applicable methods by argument-list specificity (`subclassp` per arg, left-to-right); standard method combination calls primary methods most-specific-first via `call-next-method` chain. `:before` runs all before primaries; `:after` runs all after, in reverse-specificity. `:around` wraps everything.
+- **`call-next-method`** is a *continuation* available only inside a method body. Implement as a thunk stored in a dynamic-extent variable.
+- **Generalised reference (`setf`)**: `(setf (foo x) v)` ↦ `(setf-foo v x)`. Look up the setf-expander, not just a writer fn. `define-setf-expander` is mandatory for non-trivial places. Start with the symbolic / list / aref / slot-value cases.
+- **Dynamic variables (specials):** `defvar`/`defparameter` mark a symbol as special. `let` over a special name *rebinds* in dynamic extent (use parameterize-style scope), not lexical.
+- **Symbols are package-qualified.** Reader resolves `cl:car`, `mypkg::internal`, bare `foo` (current package). Internal vs external matters for `:` (one colon) reads.
+- **`nil` is also `()` is also the empty list.** Same object. `nil` is also false. CL has no distinct unit value.
+- **LOOP macro is huge.** Build incrementally — start with `for/in`, `for/from`, `collect`, `sum`, `count`, `repeat`. Add conditional clauses (`when`, `if`, `else`) once iteration drivers stable. `named` blocks + `return-from named` last.
+- **Test corpus:** custom + curated `ansi-test` slice. Place programs in `lib/common-lisp/tests/programs/` with `.lisp` extension.
+
+## General gotchas (all loops)
+
+- SX `do` = R7RS iteration. Use `begin` for multi-expr sequences.
+- `cond`/`when`/`let` clauses evaluate only the last expr.
+- `type-of` on user fn returns `"lambda"`.
+- Shell heredoc `||` gets eaten — escape or use `case`.
+
+## Style
+
+- No comments in `.sx` unless non-obvious.
+- No new planning docs — update `plans/common-lisp-on-sx.md` inline.
+- Short, factual commit messages (`common-lisp: handler-bind + 12 tests`).
+- One feature per iteration. Commit. Log. Next.
+
+Go. Read the plan; find first `[ ]`; implement.

plans/agent-briefings/loop.md

@@ -14,7 +14,7 @@ You are the sole background agent working `/root/rose-ash/plans/js-on-sx.md`. A
 
 ## Current state (restart baseline — verify before iterating)
 
-- Branch: `loops/js`.
+- Branch: `architecture`. HEAD: `14b6586e` (HS-related, not js-on-sx).
 - `lib/js/` is **untracked** — nothing is committed yet. First commit should stage everything current on disk.
 - `lib/js/test262-upstream/` is a clone of tc39/test262 pinned at `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`. **Gitignore it** (`lib/js/.gitignore` → `test262-upstream/`). Do not commit the 50k test files.
 - `lib/js/test262-runner.py` exists but is buggy — current scoreboard is `0/8 (7 timeouts, 1 fail)`. The runner needs real work: harness script loading, batching, per-test timeout tuning, strict-mode skipping.
@@ -61,7 +61,7 @@ Tagged dict: `{:__js_string__ true :utf16 <list-of-uint16> :str <lazy-utf8-cache
 - **Scope:** only `lib/js/**` and `plans/js-on-sx.md`. Do NOT touch `spec/`, `shared/`, `lib/hyperscript/`. Shared-file issues go under the plan's "Blockers" section.
 - **SX files:** `sx-tree` MCP tools ONLY. `sx_summarise` / `sx_read_subtree` / `sx_find_all` / `sx_get_context` before edits. `sx_replace_node` / `sx_insert_child` / `sx_insert_near` / `sx_replace_by_pattern` / `sx_rename_symbol` for edits. `sx_validate` after. `sx_write_file` for new files. Never `Edit`/`Read`/`Write` on `.sx`.
 - **Shell, Python, Markdown, JSON:** edit normally.
-- **Branch:** `loops/js`. Commit, then push to `origin/loops/js`. Never touch `main`.
+- **Branch:** `architecture`. Commit locally. Never push. Never touch `main`.
 - **Commit granularity:** one feature per commit. Short, factual commit messages. Commit even if a partial fix — don't hoard changes.
 - **Tests:** `bash lib/js/test.sh` (254/254 baseline) and `bash lib/js/conformance.sh` (148/148 baseline). Never regress. If a feature requires larger refactor, split into multiple commits each green.
 - **Plan file:** append one paragraph per iteration to "Progress log". Tick `[x]` boxes. Don't rewrite history.

plans/agent-briefings/ruby-loop.md

@@ -0,0 +1,83 @@
+# ruby-on-sx loop agent (single agent, queue-driven)
+
+Role: iterates `plans/ruby-on-sx.md` forever. Fibers via delcc is the headline showcase — `Fiber.new`/`Fiber.yield`/`Fiber.resume` are textbook delimited continuations with sugar, where MRI does it via C-stack swapping. Plus blocks/yield (lexical escape continuations, same shape as Smalltalk's non-local return), method_missing, and singleton classes.
+
+```
+description: ruby-on-sx queue loop
+subagent_type: general-purpose
+run_in_background: true
+isolation: worktree
+```
+
+## Prompt
+
+You are the sole background agent working `/root/rose-ash/plans/ruby-on-sx.md`. Isolated worktree, forever, one commit per feature. Push to `origin/loops/ruby` after every commit.
+
+## Restart baseline — check before iterating
+
+1. Read `plans/ruby-on-sx.md` — roadmap + Progress log.
+2. `ls lib/ruby/` — pick up from the most advanced file.
+3. If `lib/ruby/tests/*.sx` exist, run them. Green before new work.
+4. If `lib/ruby/scoreboard.md` exists, that's your baseline.
+
+## The queue
+
+Phase order per `plans/ruby-on-sx.md`:
+
+- **Phase 1** — tokenizer + parser. Keywords, identifier sigils (`@` ivar, `@@` cvar, `$` global), strings with interpolation, `%w[]`/`%i[]`, symbols, blocks `{|x| …}` and `do |x| … end`, splats, default args, method def
+- **Phase 2** — object model + sequential eval. Class table, ancestor-chain dispatch, `super`, singleton classes, `method_missing` fallback, dynamic constant lookup
+- **Phase 3** — blocks + procs + lambdas. Method captures escape continuation `^k`; `yield` / `return` / `break` / `next` / `redo` semantics; lambda strict arity vs proc lax
+- **Phase 4** — **THE SHOWCASE**: fibers via delcc. `Fiber.new`/`Fiber.resume`/`Fiber.yield`/`Fiber.transfer`. Classic programs (generator, producer-consumer, tree-walk) green
+- **Phase 5** — modules + mixins + metaprogramming. `include`/`prepend`/`extend`, `define_method`, `class_eval`/`instance_eval`, `respond_to?`/`respond_to_missing?`, hooks
+- **Phase 6** — stdlib drive. `Enumerable` mixin, `Comparable`, Array/Hash/Range/String/Integer methods, drive corpus to 200+
+
+Within a phase, pick the checkbox that unlocks the most tests per effort.
+
+Every iteration: implement → test → commit → tick `[ ]` → Progress log → next.
+
+## Ground rules (hard)
+
+- **Scope:** only `lib/ruby/**` and `plans/ruby-on-sx.md`. Do **not** edit `spec/`, `hosts/`, `shared/`, other `lib/<lang>/` dirs, `lib/stdlib.sx`, or `lib/` root. Ruby primitives go in `lib/ruby/runtime.sx`.
+- **NEVER call `sx_build`.** 600s watchdog. If sx_server binary broken → Blockers entry, stop.
+- **Shared-file issues** → plan's Blockers with minimal repro.
+- **Delimited continuations** are in `lib/callcc.sx` + `spec/evaluator.sx` Step 5. `sx_summarise` spec/evaluator.sx first — 2300+ lines.
+- **SX files:** `sx-tree` MCP tools ONLY. `sx_validate` after edits.
+- **Worktree:** commit, then push to `origin/loops/ruby`. Never touch `main`.
+- **Commit granularity:** one feature per commit.
+- **Plan file:** update Progress log + tick boxes every commit.
+
+## Ruby-specific gotchas
+
+- **Block `return` vs lambda `return`.** Inside a block `{ ... return v }`, `return` invokes the *enclosing method's* escape continuation (non-local return). Inside a lambda `->(){ ... return v }`, `return` returns from the *lambda*. Don't conflate. Implement: blocks bind their `^method-k`; lambdas bind their own `^lambda-k`.
+- **`break` from inside a block** invokes a different escape — the *iteration loop's* escape — and the loop returns the break-value. `next` is escape from current iteration, returns iteration value. `redo` re-enters current iteration without advancing.
+- **Proc arity is lax.** `proc { |a, b, c| … }.call(1, 2)` ↦ `c = nil`. Lambda is strict — same call raises ArgumentError. Check arity at call site for lambdas only.
+- **Block argument unpacking.** `[[1,2],[3,4]].each { |a, b| … }` — single Array arg auto-unpacks for blocks (not lambdas). One arg, one Array → unpack. Frequent footgun.
+- **Method dispatch chain order:** prepended modules → class methods → included modules → superclass → BasicObject → method_missing. `super` walks from the *defining* class's position, not the receiver class's.
+- **Singleton classes** are lazily allocated. Looking up the chain for an object passes through its singleton class first, then its actual class. `class << obj; …; end` opens the singleton.
+- **`method_missing`** — fallback when ancestor walk misses. Receives `(name_symbol, *args, &blk)`. Pair with `respond_to_missing?` for `respond_to?` to also report true. Do **not** swallow NoMethodError silently.
+- **Ivars are per-object dicts.** Reading an unset ivar yields `nil` and a warning (`-W`). Don't error.
+- **Constant lookup** is first lexical (Module.nesting), then inheritance (Module.ancestors of the innermost class). Different from method lookup.
+- **`Object#send`** invokes private and public methods alike; `Object#public_send` skips privates.
+- **Class reopening.** `class Foo; def bar; …; end; end` plus a later `class Foo; def baz; …; end; end` adds methods to the same class. Class table lookups must be by-name, mutable; methods dict is mutable.
+- **Fiber semantics.** `Fiber.new { |arg| … }` creates a fiber suspended at entry. First `Fiber.resume(v)` enters with `arg = v`. Inside, `Fiber.yield(w)` returns `w` to the resumer; the next `Fiber.resume(v')` returns `v'` to the yield site. End of block returns final value to last resumer; subsequent `Fiber.resume` raises FiberError.
+- **`Fiber.transfer`** is symmetric — either side can transfer to the other; no resume/yield asymmetry. Implement on top of the same continuation pair, just don't enforce direction.
+- **Symbols are interned.** `:foo == :foo` is identity. Use SX symbols.
+- **Strings are mutable.** `s = "abc"; s << "d"; s == "abcd"`. Hash keys can be strings; hash dups string keys at insertion to be safe (or freeze them).
+- **Truthiness:** only `false` and `nil` are falsy. `0`, `""`, `[]` are truthy.
+- **Test corpus:** custom + curated RubySpec slice. Place programs in `lib/ruby/tests/programs/` with `.rb` extension.
+
+## General gotchas (all loops)
+
+- SX `do` = R7RS iteration. Use `begin` for multi-expr sequences.
+- `cond`/`when`/`let` clauses evaluate only the last expr.
+- `type-of` on user fn returns `"lambda"`.
+- Shell heredoc `||` gets eaten — escape or use `case`.
+
+## Style
+
+- No comments in `.sx` unless non-obvious.
+- No new planning docs — update `plans/ruby-on-sx.md` inline.
+- Short, factual commit messages (`ruby: Fiber.yield + Fiber.resume (+8)`).
+- One feature per iteration. Commit. Log. Next.
+
+Go. Read the plan; find first `[ ]`; implement.

plans/agent-briefings/smalltalk-loop.md

@@ -0,0 +1,77 @@
+# smalltalk-on-sx loop agent (single agent, queue-driven)
+
+Role: iterates `plans/smalltalk-on-sx.md` forever. Message-passing OO + **blocks with non-local return** on delimited continuations. Non-local return is the headline showcase — every other Smalltalk reinvents it on the host stack; on SX it falls out of the captured method-return continuation.
+
+```
+description: smalltalk-on-sx queue loop
+subagent_type: general-purpose
+run_in_background: true
+isolation: worktree
+```
+
+## Prompt
+
+You are the sole background agent working `/root/rose-ash/plans/smalltalk-on-sx.md`. Isolated worktree, forever, one commit per feature. Never push.
+
+## Restart baseline — check before iterating
+
+1. Read `plans/smalltalk-on-sx.md` — roadmap + Progress log.
+2. `ls lib/smalltalk/` — pick up from the most advanced file.
+3. If `lib/smalltalk/tests/*.sx` exist, run them. Green before new work.
+4. If `lib/smalltalk/scoreboard.md` exists, that's your baseline.
+
+## The queue
+
+Phase order per `plans/smalltalk-on-sx.md`:
+
+- **Phase 1** — tokenizer + parser (chunk format, identifiers, keywords `foo:`, binary selectors, `#sym`, `#(…)`, `$c`, blocks `[:a | …]`, cascades, message precedence)
+- **Phase 2** — object model + sequential eval (class table bootstrap, message dispatch, `super`, `doesNotUnderstand:`, instance variables)
+- **Phase 3** — **THE SHOWCASE**: blocks with non-local return via captured method-return continuation. `whileTrue:` / `ifTrue:ifFalse:` as block sends. 5 classic programs (eight-queens, quicksort, mandelbrot, life, fibonacci) green.
+- **Phase 4** — reflection + MOP: `perform:`, `respondsTo:`, runtime method addition, `becomeForward:`, `Exception` / `on:do:` / `ensure:` on top of `handler-bind`/`raise`
+- **Phase 5** — collections + numeric tower + streams
+- **Phase 6** — port SUnit, vendor Pharo Kernel-Tests slice, drive corpus to 200+
+- **Phase 7** — speed (optional): inline caching, block intrinsification
+
+Within a phase, pick the checkbox that unlocks the most tests per effort.
+
+Every iteration: implement → test → commit → tick `[ ]` → Progress log → next.
+
+## Ground rules (hard)
+
+- **Scope:** only `lib/smalltalk/**` and `plans/smalltalk-on-sx.md`. Do **not** edit `spec/`, `hosts/`, `shared/`, other `lib/<lang>/` dirs, `lib/stdlib.sx`, or `lib/` root. Smalltalk primitives go in `lib/smalltalk/runtime.sx`.
+- **NEVER call `sx_build`.** 600s watchdog. If sx_server binary broken → Blockers entry, stop.
+- **Shared-file issues** → plan's Blockers with minimal repro.
+- **Delimited continuations** are in `lib/callcc.sx` + `spec/evaluator.sx` Step 5. `sx_summarise` spec/evaluator.sx first — 2300+ lines.
+- **SX files:** `sx-tree` MCP tools ONLY. `sx_validate` after edits.
+- **Worktree:** commit locally. Never push. Never touch `main`.
+- **Commit granularity:** one feature per commit.
+- **Plan file:** update Progress log + tick boxes every commit.
+
+## Smalltalk-specific gotchas
+
+- **Method invocation captures `^k`** — the return continuation. Bind it as the block's escape token. `^expr` from inside any nested block invokes that captured `^k`. Escape past method return raises `BlockContext>>cannotReturn:`.
+- **Blocks are lambdas + escape token**, not bare lambdas. `value`/`value:`/… invoke the lambda; `^` invokes the escape.
+- **`ifTrue:` / `ifFalse:` / `whileTrue:` are ordinary block sends** — no special form. The runtime intrinsifies them in the JIT path (Tier 1 of bytecode expansion already covers this pattern).
+- **Cascade** `r m1; m2; m3` desugars to `(let ((tmp r)) (st-send tmp 'm1 ()) (st-send tmp 'm2 ()) (st-send tmp 'm3 ()))`. Result is the cascade's last send (or first, depending on parser variant — pick one and document).
+- **`super` send** looks up starting from the *defining* class's superclass, not the receiver class. Stash the defining class on the method record.
+- **Selectors are interned symbols.** Use SX symbols.
+- **Receiver dispatch:** tagged ints / floats / strings / symbols / `nil` / `true` / `false` aren't boxed. Their classes (`SmallInteger`, `Float`, `String`, `Symbol`, `UndefinedObject`, `True`, `False`) are looked up by SX type-of, not by an `:class` field.
+- **Method precedence:** unary > binary > keyword. `3 + 4 factorial` is `3 + (4 factorial)`. `a foo: b bar` is `a foo: (b bar)` (keyword absorbs trailing unary).
+- **Image / fileIn / become: between sessions** = out of scope. One-way `becomeForward:` only.
+- **Test corpus:** ~200 hand-written + a slice of Pharo Kernel-Tests. Place programs in `lib/smalltalk/tests/programs/`.
+
+## General gotchas (all loops)
+
+- SX `do` = R7RS iteration. Use `begin` for multi-expr sequences.
+- `cond`/`when`/`let` clauses evaluate only the last expr.
+- `type-of` on user fn returns `"lambda"`.
+- Shell heredoc `||` gets eaten — escape or use `case`.
+
+## Style
+
+- No comments in `.sx` unless non-obvious.
+- No new planning docs — update `plans/smalltalk-on-sx.md` inline.
+- Short, factual commit messages (`smalltalk: tokenizer + 56 tests`).
+- One feature per iteration. Commit. Log. Next.
+
+Go. Read the plan; find first `[ ]`; implement.

plans/agent-briefings/tcl-loop.md

@@ -0,0 +1,83 @@
+# tcl-on-sx loop agent (single agent, queue-driven)
+
+Role: iterates `plans/tcl-on-sx.md` forever. `uplevel`/`upvar` is the headline showcase — Tcl's superpower for defining your own control structures, requiring deep VM cooperation in any normal host but falling out of SX's first-class env-chain. Plus the Dodekalogue (12 rules), command-substitution everywhere, and "everything is a string" homoiconicity.
+
+```
+description: tcl-on-sx queue loop
+subagent_type: general-purpose
+run_in_background: true
+isolation: worktree
+```
+
+## Prompt
+
+You are the sole background agent working `/root/rose-ash/plans/tcl-on-sx.md`. Isolated worktree, forever, one commit per feature. Never push.
+
+## Restart baseline — check before iterating
+
+1. Read `plans/tcl-on-sx.md` — roadmap + Progress log.
+2. `ls lib/tcl/` — pick up from the most advanced file.
+3. If `lib/tcl/tests/*.sx` exist, run them. Green before new work.
+4. If `lib/tcl/scoreboard.md` exists, that's your baseline.
+
+## The queue
+
+Phase order per `plans/tcl-on-sx.md`:
+
+- **Phase 1** — tokenizer + parser. The Dodekalogue (12 rules): word-splitting, command sub `[…]`, var sub `$name`/`${name}`/`$arr(idx)`, double-quote vs brace word, backslash, `;`, `#` comments only at command start, single-pass left-to-right substitution
+- **Phase 2** — sequential eval + core commands. `set`/`unset`/`incr`/`append`/`lappend`, `puts`/`gets`, `expr` (own mini-language), `if`/`while`/`for`/`foreach`/`switch`, string commands, list commands, dict commands
+- **Phase 3** — **THE SHOWCASE**: `proc` + `uplevel` + `upvar`. Frame stack with proc-call push/pop; `uplevel #N script` evaluates in caller's frame; `upvar` aliases names across frames. Classic programs (for-each-line, assert macro, with-temp-var) green
+- **Phase 4** — `return -code N`, `catch`, `try`/`trap`/`finally`, `throw`. Control flow as integer codes
+- **Phase 5** — namespaces + ensembles. `namespace eval`, qualified names `::ns::cmd`, ensembles, `namespace path`
+- **Phase 6** — coroutines (built on fibers, same delcc as Ruby fibers) + system commands + drive corpus to 150+
+
+Within a phase, pick the checkbox that unlocks the most tests per effort.
+
+Every iteration: implement → test → commit → tick `[ ]` → Progress log → next.
+
+## Ground rules (hard)
+
+- **Scope:** only `lib/tcl/**` and `plans/tcl-on-sx.md`. Do **not** edit `spec/`, `hosts/`, `shared/`, other `lib/<lang>/` dirs, `lib/stdlib.sx`, or `lib/` root. Tcl primitives go in `lib/tcl/runtime.sx`.
+- **NEVER call `sx_build`.** 600s watchdog. If sx_server binary broken → Blockers entry, stop.
+- **Shared-file issues** → plan's Blockers with minimal repro.
+- **Delimited continuations** are in `lib/callcc.sx` + `spec/evaluator.sx` Step 5. `sx_summarise` spec/evaluator.sx first — 2300+ lines.
+- **SX files:** `sx-tree` MCP tools ONLY. `sx_validate` after edits.
+- **Worktree:** commit locally. Never push. Never touch `main`.
+- **Commit granularity:** one feature per commit.
+- **Plan file:** update Progress log + tick boxes every commit.
+
+## Tcl-specific gotchas
+
+- **Everything is a string.** Internally cache shimmer reps (list, dict, int, double) for performance, but every value must be re-stringifiable. Mutating one rep dirties the cached string and vice versa.
+- **The Dodekalogue is strict.** Substitution is **one-pass**, **left-to-right**. The result of a substitution is a value, not a script — it does NOT get re-parsed for further substitutions. This is what makes Tcl safe-by-default. Don't accidentally re-parse.
+- **Brace word `{…}`** is the only way to defer evaluation. No substitution inside, just balanced braces. Used for `if {expr}` body, `proc body`, `expr` arguments.
+- **Double-quote word `"…"`** is identical to a bare word for substitution purposes — it just allows whitespace in a single word. `\` escapes still apply.
+- **Comments are only at command position.** `# this is a comment` after a `;` or newline; *not* inside a command. `set x 1 # not a comment` is a 4-arg `set`.
+- **`expr` has its own grammar** — operator precedence, function calls — and does its own substitution. Brace `expr {$x + 1}` to avoid double-substitution and to enable bytecode caching.
+- **`if` and `while` re-parse** the condition only if not braced. Always use `if {…}`/`while {…}` form. The unbraced form re-substitutes per iteration.
+- **`return` from a `proc`** uses control code 2. `break` is 3, `continue` is 4. `error` is 1. `catch` traps any non-zero code; user can return non-zero with `return -code error -errorcode FOO message`.
+- **`uplevel #0 script`** is global frame. `uplevel 1 script` (or just `uplevel script`) is caller's frame. `uplevel #N` is absolute level N (0=global, 1=top-level proc, 2=proc-called-from-top, …). Negative levels are errors.
+- **`upvar #N otherVar localVar`** binds `localVar` in the current frame as an *alias* — both names refer to the same storage. Reads and writes go through the alias.
+- **`info level`** with no arg returns current level number. `info level N` (positive) returns the command list that invoked level N. `info level -N` returns the command list of the level N relative-up.
+- **Variable names with `(…)`** are array elements: `set arr(foo) 1`. Arrays are not first-class values — you can't `set x $arr`. `array get arr` gives a flat list `{key1 val1 key2 val2 …}`.
+- **List vs string.** `set l "a b c"` and `set l [list a b c]` look the same when printed but the second has a cached list rep. `lindex` works on both via shimmering. Most user code can't tell the difference.
+- **`incr x`** errors if x doesn't exist; pre-set with `set x 0` or use `incr x 0` first if you mean "create-or-increment". Or use `dict incr` for dicts.
+- **Coroutines are fibers.** `coroutine name body` starts a coroutine; calling `name` resumes it; `yield value` from inside suspends and returns `value` to the resumer. Same primitive as Ruby fibers — share the implementation under the hood.
+- **`switch`** matches first clause whose pattern matches. Default is `default`. Variant matches: glob (default), `-exact`, `-glob`, `-regexp`. Body `-` means "fall through to next clause's body".
+- **Test corpus:** custom + slice of Tcl's own tests. Place programs in `lib/tcl/tests/programs/` with `.tcl` extension.
+
+## General gotchas (all loops)
+
+- SX `do` = R7RS iteration. Use `begin` for multi-expr sequences.
+- `cond`/`when`/`let` clauses evaluate only the last expr.
+- `type-of` on user fn returns `"lambda"`.
+- Shell heredoc `||` gets eaten — escape or use `case`.
+
+## Style
+
+- No comments in `.sx` unless non-obvious.
+- No new planning docs — update `plans/tcl-on-sx.md` inline.
+- Short, factual commit messages (`tcl: uplevel + upvar (+11)`).
+- One feature per iteration. Commit. Log. Next.
+
+Go. Read the plan; find first `[ ]`; implement.

plans/apl-on-sx.md

@@ -0,0 +1,115 @@
+# APL-on-SX: rank-polymorphic primitives + glyph parser
+
+The headline showcase is **rank polymorphism** — a single primitive (`+`, `⌈`, `⊂`, `⍳`) works uniformly on scalars, vectors, matrices, and higher-rank arrays. ~80 glyph primitives + 6 operators bind together with right-to-left evaluation; the entire language is a high-density combinator algebra. The JIT compiler + primitive table pay off massively here because almost every program is `array → array` pure pipelines.
+
+End-state goal: Dyalog-flavoured APL subset, dfns + tradfns, classic programs (game-of-life, mandelbrot, prime-sieve, n-queens, conway), 100+ green tests.
+
+## Scope decisions (defaults — override by editing before we spawn)
+
+- **Syntax:** Dyalog APL surface, Unicode glyphs. `⎕`-quad system functions for I/O. `∇` tradfn header.
+- **Conformance:** "Reads like APL, runs like APL." Not byte-compat with Dyalog; we care about right-to-left semantics and rank polymorphism.
+- **Test corpus:** custom — APL idioms (Roger Hui style), classic programs, plus ~50 pattern tests for primitives.
+- **Out of scope:** ⎕-namespaces beyond a handful, complex numbers, full TAO ordering, `⎕FX` runtime function definition (use static `∇` only), nested-array-of-functions higher orders, the editor.
+- **Glyphs:** input via plain Unicode in `.apl` source files. Backtick-prefix shortcuts handled by the user's editor — we don't ship one.
+
+## Ground rules
+
+- **Scope:** only touch `lib/apl/**` and `plans/apl-on-sx.md`. Don't edit `spec/`, `hosts/`, `shared/`, or any other `lib/<lang>/**`. APL primitives go in `lib/apl/runtime.sx`.
+- **SX files:** use `sx-tree` MCP tools only.
+- **Commits:** one feature per commit. Keep `## Progress log` updated and tick roadmap boxes.
+
+## Architecture sketch
+
+```
+APL source (Unicode glyphs)
+    │
+    ▼
+lib/apl/tokenizer.sx   — glyphs, identifiers, numbers (¯ for negative), strings, strands
+    │
+    ▼
+lib/apl/parser.sx      — right-to-left with valence resolution (mon vs dyadic by position)
+    │
+    ▼
+lib/apl/transpile.sx   — AST → SX AST (entry: apl-eval-ast)
+    │
+    ▼
+lib/apl/runtime.sx     — array model, ~80 primitives, 6 operators, dfns/tradfns
+```
+
+Core mapping:
+- **Array** = SX dict `{:shape (d1 d2 …) :ravel #(v1 v2 …)}`. Scalar is rank-0 (empty shape), vector is rank-1, matrix rank-2, etc. Type uniformity not required (heterogeneous nested arrays via "boxed" elements `⊂x`).
+- **Rank polymorphism** — every scalar primitive is broadcast: `1 2 3 + 4 5 6` ↦ `5 7 9`; `(2 3⍴⍳6) + 1` ↦ broadcast scalar to matrix.
+- **Conformability** = matching shapes, or one-side scalar, or rank-1 cycling (deferred — keep strict in v1).
+- **Valence** = each glyph has a monadic and a dyadic meaning; resolution is purely positional (left-arg present → dyadic).
+- **Operator** = takes one or two function operands, returns a derived function (`f¨` = `each f`, `f/` = `reduce f`, `f∘g` = `compose`, `f⍨` = `commute`).
+- **Tradfn** `∇R←L F R; locals` = named function with explicit header.
+- **Dfn** `{⍺+⍵}` = anonymous, `⍺` = left arg, `⍵` = right arg, `∇` = recurse.
+
+## Roadmap
+
+### Phase 1 — tokenizer + parser
+- [ ] Tokenizer: Unicode glyphs (the full APL set: `+ - × ÷ * ⍟ ⌈ ⌊ | ! ? ○ ~ < ≤ = ≥ > ≠ ∊ ∧ ∨ ⍱ ⍲ , ⍪ ⍴ ⌽ ⊖ ⍉ ↑ ↓ ⊂ ⊃ ⊆ ∪ ∩ ⍳ ⍸ ⌷ ⍋ ⍒ ⊥ ⊤ ⊣ ⊢ ⍎ ⍕ ⍝`), operators (`/ \ ¨ ⍨ ∘ . ⍣ ⍤ ⍥ @`), numbers (`¯` for negative, `1E2`, `1J2` complex deferred), characters (`'a'`, `''` escape), strands (juxtaposition of literals: `1 2 3`), names, comments `⍝ …`
+- [ ] Parser: right-to-left; classify each token as function, operator, value, or name; resolve valence positionally; dfn `{…}` body, tradfn `∇` header, guards `:`, control words `:If :While :For …` (Dyalog-style)
+- [ ] Unit tests in `lib/apl/tests/parse.sx`
+
+### Phase 2 — array model + scalar primitives
+- [ ] Array constructor: `make-array shape ravel`, `scalar v`, `vector v…`, `enclose`/`disclose`
+- [ ] Shape arithmetic: `⍴` (shape), `,` (ravel), `≢` (tally / first-axis-length), `≡` (depth)
+- [ ] Scalar arithmetic primitives broadcast: `+ - × ÷ ⌈ ⌊ * ⍟ | ! ○`
+- [ ] Scalar comparison primitives: `< ≤ = ≥ > ≠`
+- [ ] Scalar logical: `~ ∧ ∨ ⍱ ⍲`
+- [ ] Index generator: `⍳n` (vector 1..n or 0..n-1 depending on `⎕IO`)
+- [ ] `⎕IO` = 1 default (Dyalog convention)
+- [ ] 40+ tests in `lib/apl/tests/scalar.sx`
+
+### Phase 3 — structural primitives + indexing
+- [ ] Reshape `⍴`, ravel `,`, transpose `⍉` (full + dyadic axis spec)
+- [ ] Take `↑`, drop `↓`, rotate `⌽` (last axis), `⊖` (first axis)
+- [ ] Catenate `,` (last axis) and `⍪` (first axis)
+- [ ] Index `⌷` (squad), bracket-indexing `A[I]` (sugar for `⌷`)
+- [ ] Grade-up `⍋`, grade-down `⍒`
+- [ ] Enclose `⊂`, disclose `⊃`, partition (subset deferred)
+- [ ] Membership `∊`, find `⍳` (dyadic), without `~` (dyadic), unique `∪` (deferred to phase 6)
+- [ ] 40+ tests in `lib/apl/tests/structural.sx`
+
+### Phase 4 — operators (THE SHOWCASE)
+- [ ] Reduce `f/` (last axis), `f⌿` (first axis) — including `∧/`, `∨/`, `+/`, `×/`, `⌈/`, `⌊/`
+- [ ] Scan `f\`, `f⍀`
+- [ ] Each `f¨` — applies `f` to each scalar/element
+- [ ] Outer product `∘.f` — `1 2 3 ∘.× 1 2 3` ↦ multiplication table
+- [ ] Inner product `f.g` — `+.×` is matrix multiply
+- [ ] Commute `f⍨` — `f⍨ x` ↔ `x f x`, `x f⍨ y` ↔ `y f x`
+- [ ] Compose `f∘g` — applies `g` first then `f`
+- [ ] Power `f⍣n` — apply f n times; `f⍣≡` until fixed point
+- [ ] Rank `f⍤k` — apply f at sub-rank k
+- [ ] At `@` — selective replace
+- [ ] 40+ tests in `lib/apl/tests/operators.sx`
+
+### Phase 5 — dfns + tradfns + control flow
+- [ ] Dfn `{…}` with `⍺` (left arg, may be absent → niladic/monadic), `⍵` (right arg), `∇` (recurse), guards `cond:expr`, default left arg `⍺←default`
+- [ ] Local assignment via `←` (lexical inside dfn)
+- [ ] Tradfn `∇` header: `R←L F R;l1;l2`, statement-by-statement, branch via `→linenum`
+- [ ] Dyalog control words: `:If/:Else/:EndIf`, `:While/:EndWhile`, `:For X :In V :EndFor`, `:Select/:Case/:EndSelect`, `:Trap`/`:EndTrap`
+- [ ] Niladic / monadic / dyadic dispatch (function valence at definition time)
+- [ ] `lib/apl/conformance.sh` + runner, `scoreboard.json` + `scoreboard.md`
+
+### Phase 6 — classic programs + drive corpus
+- [ ] Classic programs in `lib/apl/tests/programs/`:
+  - [ ] `life.apl` — Conway's Game of Life as a one-liner using `⊂` `⊖` `⌽` `+/`
+  - [ ] `mandelbrot.apl` — complex iteration with rank-polymorphic `+ × ⌊` (or real-axis subset)
+  - [ ] `primes.apl` — `(2=+⌿0=A∘.|A)/A←⍳N` sieve
+  - [ ] `n-queens.apl` — backtracking via reduce
+  - [ ] `quicksort.apl` — the classic Roger Hui one-liner
+- [ ] System functions: `⎕FMT`, `⎕FR` (float repr), `⎕TS` (timestamp), `⎕IO`, `⎕ML` (migration level — fixed at 1), `⎕←` (print)
+- [ ] Drive corpus to 100+ green
+- [ ] Idiom corpus — `lib/apl/tests/idioms.sx` covering classic Roger Hui / Phil Last idioms
+
+## Progress log
+
+_Newest first._
+
+- _(none yet)_
+
+## Blockers
+
+- _(none yet)_

plans/common-lisp-on-sx.md

@@ -0,0 +1,121 @@
+# Common-Lisp-on-SX: conditions + restarts on delimited continuations
+
+The headline showcase is the **condition system**. Restarts are *resumable* exceptions — every other Lisp implementation reinvents this on host-stack unwind tricks. On SX restarts are textbook delimited continuations: `signal` walks the handler chain; `invoke-restart` resumes the captured continuation at the restart point. Same delcc primitive that powers Erlang actors, expressed as a different surface.
+
+End-state goal: ANSI Common Lisp subset with a working condition/restart system, CLOS multimethods (with `:before`/`:after`/`:around`), the LOOP macro, packages, and ~150 hand-written + classic programs.
+
+## Scope decisions (defaults — override by editing before we spawn)
+
+- **Syntax:** ANSI Common Lisp surface. Read tables, dispatch macros (`#'`, `#(`, `#\`, `#:`, `#x`, `#b`, `#o`, ratios `1/3`).
+- **Conformance:** ANSI X3.226 *as a target*, not bug-for-bug SBCL/CCL. "Reads like CL, runs like CL."
+- **Test corpus:** custom + a curated slice of `ansi-test`. Plus classic programs: condition-system demo, restart-driven debugger, multiple-dispatch geometry, LOOP corpus.
+- **Out of scope:** compilation to native, FFI, sockets, threads, MOP class redefinition, full pathname/logical-pathname machinery, structures with `:include` deep customization.
+- **Packages:** simple — `defpackage`/`in-package`/`export`/`use-package`/`:cl`/`:cl-user`. No nicknames, no shadowing-import edge cases.
+
+## Ground rules
+
+- **Scope:** only touch `lib/common-lisp/**` and `plans/common-lisp-on-sx.md`. Don't edit `spec/`, `hosts/`, `shared/`, or any other `lib/<lang>/**`. CL primitives go in `lib/common-lisp/runtime.sx`.
+- **SX files:** use `sx-tree` MCP tools only.
+- **Commits:** one feature per commit. Keep `## Progress log` updated and tick roadmap boxes.
+
+## Architecture sketch
+
+```
+Common Lisp source
+    │
+    ▼
+lib/common-lisp/reader.sx     — tokenizer + reader (read macros, dispatch chars)
+    │
+    ▼
+lib/common-lisp/parser.sx     — AST: forms, declarations, lambda lists
+    │
+    ▼
+lib/common-lisp/transpile.sx  — AST → SX AST (entry: cl-eval-ast)
+    │
+    ▼
+lib/common-lisp/runtime.sx    — special forms, condition system, CLOS, packages, BIFs
+```
+
+Core mapping:
+- **Symbol** = SX symbol with package prefix; package table is a flat dict.
+- **Cons cell** = SX pair via `cons`/`car`/`cdr`; lists native.
+- **Multiple values** = thread through `values`/`multiple-value-bind`; primary-value default for one-context callers.
+- **Block / return-from** = captured continuation; `return-from name v` invokes the block-named `^k`.
+- **Tagbody / go** = each tag is a continuation; `go tag` invokes it.
+- **Unwind-protect** = scope frame with a cleanup thunk fired on any non-local exit.
+- **Conditions / restarts** = layered handler chain on top of `handler-bind` + delcc. `signal` walks handlers; `invoke-restart` resumes a captured continuation.
+- **CLOS** = generic functions are dispatch tables on argument-class lists; method combination computed lazily; `call-next-method` is a continuation.
+- **Macros** = SX macros (sentinel-body) — defmacro lowers directly.
+
+## Roadmap
+
+### Phase 1 — reader + parser
+- [ ] Tokenizer: symbols (with package qualification `pkg:sym` / `pkg::sym`), numbers (int, float, ratio `1/3`, `#xFF`, `#b1010`, `#o17`), strings `"…"` with `\` escapes, characters `#\Space` `#\Newline` `#\a`, comments `;`, block comments `#| … |#`
+- [ ] Reader: list, dotted pair, quote `'`, function `#'`, quasiquote `` ` ``, unquote `,`, splice `,@`, vector `#(…)`, uninterned `#:foo`, nil/t literals
+- [ ] Parser: lambda lists with `&optional` `&rest` `&key` `&aux` `&allow-other-keys`, defaults, supplied-p variables
+- [ ] Unit tests in `lib/common-lisp/tests/read.sx`
+
+### Phase 2 — sequential eval + special forms
+- [ ] `cl-eval-ast`: `quote`, `if`, `progn`, `let`, `let*`, `flet`, `labels`, `setq`, `setf` (subset), `function`, `lambda`, `the`, `locally`, `eval-when`
+- [ ] `block` + `return-from` via captured continuation
+- [ ] `tagbody` + `go` via per-tag continuations
+- [ ] `unwind-protect` cleanup frame
+- [ ] `multiple-value-bind`, `multiple-value-call`, `multiple-value-prog1`, `values`, `nth-value`
+- [ ] `defun`, `defparameter`, `defvar`, `defconstant`, `declaim`, `proclaim` (no-op)
+- [ ] Dynamic variables — `defvar`/`defparameter` produce specials; `let` rebinds via parameterize-style scope
+- [ ] 60+ tests in `lib/common-lisp/tests/eval.sx`
+
+### Phase 3 — conditions + restarts (THE SHOWCASE)
+- [ ] `define-condition` — class hierarchy rooted at `condition`/`error`/`warning`/`simple-error`/`simple-warning`/`type-error`/`arithmetic-error`/`division-by-zero`
+- [ ] `signal`, `error`, `cerror`, `warn` — all walk the handler chain
+- [ ] `handler-bind` — non-unwinding handlers, may decline by returning normally
+- [ ] `handler-case` — unwinding handlers (delcc abort)
+- [ ] `restart-case`, `with-simple-restart`, `restart-bind`
+- [ ] `find-restart`, `invoke-restart`, `invoke-restart-interactively`, `compute-restarts`
+- [ ] `with-condition-restarts` — associate restarts with a specific condition
+- [ ] `*break-on-signals*`, `*debugger-hook*` (basic)
+- [ ] Classic programs in `lib/common-lisp/tests/programs/`:
+  - [ ] `restart-demo.lisp` — division with `:use-zero` and `:retry` restarts
+  - [ ] `parse-recover.lisp` — parser with skipped-token restart
+  - [ ] `interactive-debugger.lisp` — ASCII REPL using `:debugger-hook`
+- [ ] `lib/common-lisp/conformance.sh` + runner, `scoreboard.json` + `scoreboard.md`
+
+### Phase 4 — CLOS
+- [ ] `defclass` with `:initarg`/`:initform`/`:accessor`/`:reader`/`:writer`/`:allocation`
+- [ ] `make-instance`, `slot-value`, `(setf slot-value)`, `with-slots`, `with-accessors`
+- [ ] `defgeneric` with `:method-combination` (standard, plus `+`, `and`, `or`)
+- [ ] `defmethod` with `:before` / `:after` / `:around` qualifiers
+- [ ] `call-next-method` (continuation), `next-method-p`
+- [ ] `class-of`, `find-class`, `slot-boundp`, `change-class` (basic)
+- [ ] Multiple dispatch — method specificity by argument-class precedence list
+- [ ] Built-in classes registered for tagged values (`integer`, `float`, `string`, `symbol`, `cons`, `null`, `t`)
+- [ ] Classic programs:
+  - [ ] `geometry.lisp` — `intersect` generic dispatching on (point line), (line line), (line plane)…
+  - [ ] `mop-trace.lisp` — `:before` + `:after` printing call trace
+
+### Phase 5 — macros + LOOP + reader macros
+- [ ] `defmacro`, `macrolet`, `symbol-macrolet`, `macroexpand-1`, `macroexpand`
+- [ ] `gensym`, `gentemp`
+- [ ] `set-macro-character`, `set-dispatch-macro-character`, `get-macro-character`
+- [ ] **The LOOP macro** — iteration drivers (`for … in/across/from/upto/downto/by`, `while`, `until`, `repeat`), accumulators (`collect`, `append`, `nconc`, `count`, `sum`, `maximize`, `minimize`), conditional clauses (`if`/`when`/`unless`/`else`), termination (`finally`/`thereis`/`always`/`never`), `named` blocks
+- [ ] LOOP test corpus: 30+ tests covering all clause types
+
+### Phase 6 — packages + stdlib drive
+- [ ] `defpackage`, `in-package`, `export`, `use-package`, `import`, `find-package`
+- [ ] Package qualification at the reader level — `cl:car`, `mypkg::internal`
+- [ ] `:common-lisp` (`:cl`) and `:common-lisp-user` (`:cl-user`) packages
+- [ ] Sequence functions — `mapcar`, `mapc`, `mapcan`, `reduce`, `find`, `find-if`, `position`, `count`, `every`, `some`, `notany`, `notevery`, `remove`, `remove-if`, `subst`
+- [ ] List ops — `assoc`, `getf`, `nth`, `last`, `butlast`, `nthcdr`, `tailp`, `ldiff`
+- [ ] String ops — `string=`, `string-upcase`, `string-downcase`, `subseq`, `concatenate`
+- [ ] FORMAT — basic directives `~A`, `~S`, `~D`, `~F`, `~%`, `~&`, `~T`, `~{...~}` (iteration), `~[...~]` (conditional), `~^` (escape), `~P` (plural)
+- [ ] Drive corpus to 200+ green
+
+## Progress log
+
+_Newest first._
+
+- _(none yet)_
+
+## Blockers
+
+- _(none yet)_

plans/hs-blockers-drain.md

@@ -0,0 +1,96 @@
+# HS conformance — blockers drain
+
+Goal: take hyperscript conformance from **1277/1496 (85.4%)** to **1496/1496 (100%)** by clearing the blocked clusters and the design-done Bucket E subsystems.
+
+This plan exists because the per-iteration `loops/hs` agent can't fit these into its 30-min budget — they need dedicated multi-commit sit-downs. Track progress here; refer to `plans/hs-conformance-to-100.md` for the canonical cluster ledger.
+
+## Current state (2026-04-25)
+
+- Loop running in `/root/rose-ash-loops/hs` (branch `loops/hs`)
+- sx-tree MCP **fixed** (was a session-stale binary issue — restart of claude in the tmux window picked it up). Loop hinted to retry **#32**, **#29** first.
+- Recent loop progress: ~1 commit/6h — easy wins drained, what's left needs focused attention.
+
+## Remaining work
+
+### Bucket-A/B/C blockers (small, in-place fixes)
+
+| # | Cluster | Tests | Effort | Blocker | Fix sketch |
+|---|---------|------:|--------|---------|------------|
+| **17** | `tell` semantics | +3 | ~1h | Implicit-default-target ambiguity. `bare add .bar` inside `tell X` should target `X` but explicit `to me` must reach the original element. | Add `beingTold` symbol distinct from `me`; bare commands compile to `beingTold-or-me`; explicit `me` always the original. |
+| **22** | window global fn fallback | +2-4 | ~1h | `foo()` where `foo` isn't SX-defined needs to fall back to `(host-global "foo")`. Three attempts failed: guard (host-level error not catchable), `env-has?` (not in HS kernel), `hs-win-call` (NativeFn not callable from CALL). | Add `symbol-bound?` predicate to HS kernel **OR** a host-call-fn primitive with arity-agnostic dispatch. |
+| **29** | `hyperscript:before:init` / `:after:init` / `:parse-error` events | +4-6 | ~30m (post sx-tree fix) | Was sx-tree MCP outage. Now unblocked — loop should retry. 4 of 6 tests need stricter parser error-rejection (out of scope; mark partial). | Edit `integration.sx` to fire DOM events at activation boundaries. |
+
+### Bucket D — medium features
+
+| # | Cluster | Tests | Effort | Status |
+|---|---------|------:|--------|--------|
+| **31** | runtime null-safety error reporting | **+15-18** | **2-4h** | **THIS SESSION'S TARGET.** Plan node fully spec'd: 5 pieces of work. |
+| **32** | MutationObserver mock + `on mutation` | +10-15 | ~2h | Was sx-tree-blocked. Now unblocked — loop hinted to retry. Multi-file: parser, compiler, runtime, runner mock, generator skip-list. |
+| **33** | cookie API | +2 (remaining) | ~30m | Partial done (+3). Remaining 2 need `hs-method-call` runtime fallback for unknown methods + `hs-for-each` recognising host-array/proxy collections. |
+| 34 | event modifier DSL | +6-8 | ~1-2h | `elsewhere`, `every`, count filters (`once`/`twice`/`3 times`/ranges), `from elsewhere`. Pending. |
+| 35 | namespaced `def` | +3 | ~30m | Pending. |
+
+### Bucket E — subsystems (design docs landed, multi-commit each)
+
+Each has a design doc with a step-by-step checklist. These are 1-2 days of focused work each, not loop-fits.
+
+| # | Subsystem | Tests | Design doc | Branch |
+|---|-----------|------:|------------|--------|
+| 36 | WebSocket + `socket` + RPC Proxy | +12-16 | `plans/designs/e36-websocket.md` | `worktree-agent-a9daf73703f520257` |
+| 37 | Tokenizer-as-API | +16-17 | `plans/designs/e37-tokenizer-api.md` | `worktree-agent-a6bb61d59cc0be8b4` |
+| 38 | SourceInfo API | +4 | `plans/designs/e38-sourceinfo.md` | `agent-e38-sourceinfo` |
+| 39 | WebWorker plugin (parser-only stub) | +1 | `plans/designs/e39-webworker.md` | `hs-design-e39-webworker` |
+| 40 | Real Fetch / non-2xx / before-fetch | +7 | `plans/designs/e40-real-fetch.md` | `worktree-agent-a94612a4283eaa5e0` |
+
+### Bucket F — generator translation gaps
+
+~25 tests SKIP'd because `tests/playwright/generate-sx-tests.py` bails with `return None`. Single dedicated generator-repair sit-down once Bucket D is drained. ~half-day.
+
+## Order of attack
+
+In approximate cost-per-test order:
+
+1. **Loop self-heal** (no human work) — wait for #29, #32 to land via the running loop ⏱️ ~next 1-2 hours
+2. **#31 null-safety** — biggest scoped single win, dedicated worktree agent (this session)
+3. **#33 cookie API remainder** — quick partial completion
+4. **#17 / #22 / #34 / #35** — small fiddly fixes, one sit-down each
+5. **Bucket E** — pick one subsystem at a time. **#39 (WebWorker stub) first** — single commit, smallest. Then **#38 (SourceInfo)** — 4 commits. Then the bigger three (#36, #37, #40).
+6. **Bucket F** — generator repair sweep at the end.
+
+Estimated total to 100%: ~10-15 days of focused work, parallelisable across branches.
+
+## Cluster #31 spec (full detail)
+
+The plan note from `hs-conformance-to-100.md`:
+
+> 18 tests in `runtimeErrors`. When accessing `.foo` on nil, emit a structured error with position info. One coordinated fix in the compiler emit paths for property access, function calls, set/put.
+
+**Required pieces:**
+
+1. **Generator-side `eval-hs-error` helper + recognizer** for `expect(await error("HS")).toBe("MSG")` blocks. In `tests/playwright/generate-sx-tests.py`.
+2. **Runtime helpers** in `lib/hyperscript/runtime.sx`:
+   - `hs-null-error!` raising `'<sel>' is null`
+   - `hs-named-target` — wraps a query result with the original selector source
+   - `hs-named-target-list` — same for list results
+3. **Compiler patches at every target-position `(query SEL)` emit** — wrap in named-target carrying the original selector source. ~17 command emit paths in `lib/hyperscript/compiler.sx`:
+   add, remove, hide, show, measure, settle, trigger, send, set, default, increment, decrement, put, toggle, transition, append, take.
+4. **Function-call null-check** at bare `(name)`, `hs-method-call`, and `host-get` chains, deriving the leftmost-uncalled-name (`'x'` / `'x.y'`) from the parse tree.
+5. **Possessive-base null-check** (`set x's y to true` → `'x' is null`).
+
+**Files in scope:**
+- `lib/hyperscript/runtime.sx` (new helpers)
+- `lib/hyperscript/compiler.sx` (~17 emit-path edits)
+- `tests/playwright/generate-sx-tests.py` (test recognizer)
+- `tests/hs-run-filtered.js` (if mock helpers needed)
+- `shared/static/wasm/sx/hs-runtime.sx` + `hs-compiler.sx` (WASM staging copies)
+
+**Approach:** target-named pieces incrementally — runtime helpers first (no compiler change), then compiler emit paths in batches (group similar commands), then function-call/possessive at the end. Each batch is one commit if it lands +N tests; mark partial if it only unlocks part.
+
+**Watch for:** smoke-range regressions (tests flipping pass→fail). Each commit: rerun smoke 0-195 and the `runtimeErrors` suite.
+
+## Notes for future sessions
+
+- `plans/hs-conformance-to-100.md` is the canonical cluster ledger — update it on every commit.
+- `plans/hs-conformance-scoreboard.md` is the live tally — bump `Merged:` and the bucket roll-up.
+- Loop has scope rule "never edit `spec/evaluator.sx` or broader SX kernel" — most fixes here stay in `lib/hyperscript/**`, `tests/`, generator. If a fix needs kernel work, surface to the user; don't merge silently.
+- Cluster #22's `symbol-bound?` predicate would be a kernel addition — that's a real cross-boundary scope expansion.

plans/js-on-sx.md

@@ -65,7 +65,7 @@ Each item: implement → tests → update progress. Mark `[x]` when tests green.
 - [x] Punctuation: `( ) { } [ ] , ; : . ...`
 - [x] Operators: `+ - * / % ** = == === != !== < > <= >= && || ! ?? ?: & | ^ ~ << >> >>> += -= ...`
 - [x] Comments (`//`, `/* */`)
-- [x] Automatic Semicolon Insertion (defer — initially require semicolons)
+- [ ] Automatic Semicolon Insertion (defer — initially require semicolons)
 
 ### Phase 2 — Expression parser (Pratt-style)
 - [x] Literals → AST nodes
@@ -124,7 +124,7 @@ Each item: implement → tests → update progress. Mark `[x]` when tests green.
 - [x] Closures — work via SX `fn` env capture
 - [x] Rest params (`...rest` → `&rest`)
 - [x] Default parameters (desugar to `if (param === undefined) param = default`)
-- [x] `var` hoisting (shallow — collects direct `var` decls, emits `(define name :js-undefined)` before funcdecls)
+- [ ] `var` hoisting (deferred — treated as `let` for now)
 - [ ] `let`/`const` TDZ (deferred)
 
 ### Phase 8 — Objects, prototypes, `this`
@@ -158,272 +158,6 @@ Each item: implement → tests → update progress. Mark `[x]` when tests green.
 
 Append-only record of completed iterations. Loop writes one line per iteration: date, what was done, test count delta.
 
-- 2026-05-10 — **`String.prototype.repeat` no longer arity-collides with itself; raises RangeError on negative or +Infinity counts.** Earlier JSON.stringify iteration introduced a 2-arg `js-string-repeat` that shadowed the existing 3-arg `(s n acc)` accumulator implementation, breaking every `s.repeat(n)` call with "expects 2 args, got 3". Renamed the accumulator helper to `js-string-repeat-loop` and made `js-string-repeat` a 2-arg facade that delegates. Hooked the repeat method to raise RangeError when `count < 0` or `count = Infinity` per spec. Result: built-ins/String/prototype/repeat 7/13 → 11/13 (+4). conformance.sh: 148/148.
-
-- 2026-05-10 — **test262-runner inlines small upstream harness includes (`nans.js`, `sta.js`, `byteConversionValues.js`, `compareArray.js`) per-test.** The runner parsed `includes:` frontmatter but never used it, so tests like `built-ins/isNaN/return-true-nan.js` (which depends on `var NaNs = [...]`) failed with "ReferenceError: undefined symbol". Added `_load_harness_include` (cached) and `assemble_source` now prepends each allowlisted include's source to the test. Allowlist excludes large helpers like `propertyHelper.js` because per-test js-eval+JIT cost on a 371-line harness pushes tests over the 15s per-test timeout (regressed Math/abs 7/7 → 4/7 in a first-pass attempt before allowlisting). Result: built-ins/isNaN 2/7 → 3/7. conformance.sh: 148/148.
-
-- 2026-05-10 — **Real `Date.prototype.setFullYear/setMonth/setDate/setHours/setMinutes/setSeconds/setMilliseconds` (+ UTC variants) and a corrected `setTime`.** All Date setters were missing — only `setTime` existed and didn't validate. Added a unified `js-date-setter(d, field, args)` that decomposes the current ms into `(y mo da hh mm ss msv)` via `js-date-decompose`, splices in the `args` per the field's optional-arg contract (e.g. `setHours(h, m?, s?, ms?)`), recomposes via `js-date-civil-to-days`, and TimeClips at ±8.64e15. NaN args anywhere → ms set to NaN. Wired all 14 setters to the helper. Hit a parser gotcha: SX `cond` clause body is single-form only — multi-expression bodies like `(else (dict-set! ...) new-ms)` silently treat the second form as `(<first-result> new-ms)` ("Not callable: false"). Wrapped these in `(begin ...)`. Result: setFullYear 5/18 → 13/18 (+8). setHours 5/21 → 15/21 (+10). setMonth 3/15 → 9/15 (+6). setMinutes 4/16 → 10/16 (+6). setSeconds 3/15 → 9/15 (+6). setDate 2/12 → 6/12 (+4). setMilliseconds 2/12 → 6/12 (+4). setTime 4/9 → 6/9 (+2). conformance.sh: 148/148.
-
-- 2026-05-10 — **`Object.assign` keys now visible to `Object.keys` / `JSON.stringify`.** `Object.assign({}, {a:1})` was mutating the target via `dict-set!` which bypasses our `__js_order__` insertion-order side table; `Object.keys(t)` (which iterates `__js_order__` when present) returned `[]`, and `JSON.stringify` saw nothing. Switched `js-object-assign` to use `js-set-prop` (which calls `js-obj-order-add!` on new keys) for both dict and string sources. Result: built-ins/Object/assign 13/25 → 14/25. conformance.sh: 148/148.
-
-- 2026-05-10 — **User functions' `prototype` chain through Object.prototype + auto-set `constructor`.** Per ES spec, every function's `prototype` slot defaults to `{ constructor: F, __proto__: Object.prototype }`. Our `js-get-ctor-proto` lazily created a fresh empty `(dict)` for user functions on first access — so `(new F) instanceof Object` was `false`, `F.prototype.constructor` was undefined, and `x.constructor === F` failed. Now the lazy-init seeds the proto with `__proto__ → Object.prototype` and `constructor → F` before caching in `__js_proto_table__`. Result: language/expressions/instanceof 25/30 → 26/30. conformance.sh: 148/148.
-
-- 2026-05-10 — **Postfix `++`/`--` reject a preceding LineTerminator (ASI).** Per ES spec, `x\n++;` is a syntax error: no LineTerminator allowed between LHS and postfix `++`/`--`. Our `jp-parse-postfix` was matching `++`/`--` regardless of whether the preceding token had `:nl true`. Added `(not (jp-token-nl? st))` guard so newline-before-`++` makes the postfix arm fall through, the `++` then becomes a prefix-expr starting a new statement, which fails to parse and the runner classifies as SyntaxError. Result: language/expressions/postfix-increment 16/30 → 18/30 (+2). postfix-decrement 16/30 → 18/30 (+2). conformance.sh: 148/148.
-
-- 2026-05-10 — **Parse-time SyntaxError when `let`/`const`/`function`/`class` appear as a single-statement body of `if`/`while`/`do`/`for`/labeled.** Per ES grammar, those positions accept a Statement, not a Declaration — only block bodies (`{ ... }`) may contain Declarations. Added `jp-disallow-decl-stmt!` helper that, when the next token is a Declaration keyword in single-statement context, raises SyntaxError. The `let` arm checks for `let <ident>`, `let [`, or `let {` to avoid mis-rejecting `let;` (where `let` is just an identifier expression). Hook calls in `jp-parse-if-stmt` (then + else branches), `jp-parse-while-stmt`, `jp-parse-do-while-stmt`, both for-of/in and C-for body sites, and the labeled-statement entry. Result: language/statements/while 16/30 → 20/30. statements/labeled 4/15 → 7/15. statements/if 20/30 → 21/30. conformance.sh: 148/148.
-
-- 2026-05-10 — **Parse-time SyntaxError for `break`/`continue` outside loops/switches and `return` outside functions; `void <expr>` evaluates `<expr>` for side effects.** Parser tracks `:loop-depth`, `:switch-depth`, and `:fn-depth` on the state dict (initialized to 0). `jp-parse-while-stmt`, `jp-parse-do-while-stmt`, `jp-parse-for-stmt` (both for-of/in and C-for) bump `:loop-depth` around body parsing; `jp-parse-switch-stmt` bumps `:switch-depth`; new `jp-parse-fn-body` and `jp-parse-arrow-body` save+reset loop/switch depth and bump `:fn-depth` (so `break` inside an outer loop's nested function is rejected). Bare `break` requires `loop-depth > 0 OR switch-depth > 0`; bare `continue` requires `loop-depth > 0`; `return` requires `fn-depth > 0`. Separately, `void <expr>` was compiling to just `:js-undefined` (dropping the expression entirely); now `(begin <expr> :js-undefined)` so side effects fire. Result: language/statements/return 4/15 → 14/15 (+10). statements/break 9/20 → 12/20. statements/continue 12/24 → 15/24. expressions/void 7/9 → 8/9. conformance.sh: 148/148.
-
-- 2026-05-10 — **`Math.hypot` and `Math.cbrt` honour spec edges for NaN, ±Infinity, and ±0.** `Math.hypot(NaN, Infinity)` was returning NaN instead of +Infinity (spec: any ±Infinity arg dominates NaN). Rewrote `js-math-hypot` to scan args once tracking inf/nan flags, return +Infinity if any arg is ±Infinity, else NaN if any was NaN, else `sqrt(sum of squares)`. `Math.cbrt(NaN)` was 0 (because `pow(NaN, 1/3)` produced 0 in our path); also `Math.cbrt(-0)` returned +0 instead of -0. Added explicit short-circuits: NaN→NaN, ±Infinity→arg, ±0→arg, plus changed `(/ 1 3)` (rational) to `(/ 1.0 3.0)` (inexact) to avoid rational fractional-power oddities. Result: built-ins/Math/hypot 9/11 → 10/11. Math/cbrt 3/4 → 4/4. conformance.sh: 148/148.
-
-- 2026-05-10 — **`globalThis.globalThis === globalThis`; `Number.prototype.toFixed` honours digit-range and ≥1e21 fallback.** (1) `globalThis` was bound to `nil` in the global object literal (originally to dodge an inspect-cycle hang) — added `(dict-set! js-global "globalThis" js-global)` after the literal so `globalThis.globalThis === globalThis` per spec. (2) `Number.prototype.toFixed` rewrites: RangeError when fractionDigits is NaN or outside `[0,100]` (was silently producing garbage), and for `|x| >= 1e21` returns `js-number-to-string` (the value's own ToString) per spec step 9. conformance.sh: 148/148.
-
-- 2026-05-10 — **`delete <ident>` returns `false` instead of `true` per non-strict spec.** ES non-strict semantics: `delete x` where `x` is a declared binding (variable / function / parameter) returns `false` and does not unbind. Our transpiler was emitting `true` for any `delete <expr>` whose argument wasn't a member or index access. Now `delete <js-ident>` → `false`, and `delete <js-paren expr>` recurses on the inner expression so `delete (1+2)` still works. Result: language/expressions/delete 14/30 → 18/30 (+4). conformance.sh: 148/148.
-
-- 2026-05-10 — **Parser rejects unary-op directly before `**` (e.g. `-1 ** 2`, `delete o.p ** 2`, `!x ** 2`, `~x ** 2`) per ES spec.** ES disallows `UnaryExpression ** ExponentiationExpression`; only `UpdateExpression ** ExponentiationExpression` and `(<UnaryExpr>) ** ...` are legal. Added a guard in `jp-binary-loop`: when op is `**` and the LHS is a `(js-unop ...)` node, raise SyntaxError. Parens are made transparent for everything except this check via a new `jp-paren-wrap` helper that emits `(js-paren <unop>)` only when wrapping an explicit unary op (so `(-1) ** 2` parses fine), and a new `js-paren` AST tag in `js-transpile` that just unwraps. Result: language/expressions/exponentiation 25/30 → 28/30 (+3). conformance.sh: 148/148.
-
-- 2026-05-10 — **`Math.round` / `Math.max` / `Math.min` honour spec edge cases for NaN, ±Infinity, and ±0.** `Math.round(NaN)` was returning 0 because `floor(NaN+0.5)` doesn't propagate NaN; ditto `±Infinity` paths. `Math.max({})` silently returned `-Infinity` (initial accumulator) because the first arg wasn't ToNumber'd. `Math.max(0, -0)` returned `-0` because `>` doesn't distinguish them. Rewrites: round NaN/±Infinity/±0 short-circuits; max/min ToNumber the first arg, propagate NaN immediately, and use a `js-is-positive-zero?` (rational-safe) tiebreaker so `Math.max(0, -0) === 0` per spec. Result: built-ins/Math/round 5/10 → 8/10 (+3). Math/max 6/9 → 8/9 (+2). Math/min 6/9 → 8/9 (+2). conformance.sh: 148/148.
-
-- 2026-05-10 — **`Map.prototype.*` and `Set.prototype.*` raise TypeError when called on non-Map / non-Set `this`.** All five `js-map-do-*` and four `js-set-do-*` helpers were assuming `this` had `__map_keys__` / `__set_items__`, so `Map.prototype.clear.call({})` silently returned undefined (after creating dangling state) instead of throwing. Added `js-map-check!` / `js-set-check!` guards run as the first step of each method; raise spec-correct `TypeError` instances. Result: built-ins/Map 18/30 → 22/30 (+4). built-ins/Set 15/30 → 28/30 (+13). conformance.sh: 148/148.
-
-- 2026-05-10 — **`Date.UTC` / `new Date(...)` propagate NaN/±Infinity arguments and return NaN.** `Date.UTC()` (no args) returned 0 instead of NaN; `Date.UTC(NaN, ...)` did the math and produced bogus ms; `new Date(year, NaN)` constructed a normal Date instead of an invalid one. Added `js-date-args-have-nan?` (also detects ±Infinity and propagates from rationals) used by both `Date.UTC` and the multi-arg constructor branch; UTC now returns NaN on no-arg / any-NaN-arg / out-of-range result, and `new Date(args)` stores NaN in `__date_value__` when any arg is NaN. Also fixed `js-date-from-one(undefined)` to return NaN. Result: built-ins/Date/UTC 6/16 → 10/16 (+4). Date 17/30 → 26/30 (timeouts dropped from 12 → 4 because invalid Dates now short-circuit). conformance.sh: 148/148.
-
-- 2026-05-10 — **Real `Date` construction + getters via Howard-Hinnant civil-day arithmetic.** `js-date-from-parts` now computes a true ms-since-epoch from `(year, month, day, hour, min, sec, ms)` via `js-date-civil-to-days` (the inverse of last iteration's `days-to-ymd`), with the legacy 2-digit-year coercion (0..99 → 1900+y). `getFullYear/Month/Date/Day/Hours/Minutes/Seconds/Milliseconds` (UTC + non-UTC) all share a new `js-date-getter`: TypeErrors on non-Date this, returns NaN on invalid time, otherwise decomposes ms into y/m/d/h/m/s/ms/dow. Plus added `Date.prototype.constructor = Date` (was missing). Result: each of the 8 Date getter categories went 2/6 → 5/6 (+3 each, +24 total). Date toISOString 11/16 → 13/16. Some Date construction-loop tests now exceed the 15s per-test timeout — the new civil math is heavier than the old (year-1970)*ms-per-year approximation, but correctness wins. conformance.sh: 148/148.
-
-- 2026-05-10 — **`Date.prototype.toISOString` produces real `YYYY-MM-DDTHH:mm:ss.sssZ` and validates input.** Old `js-date-iso` only computed the year and hardcoded the rest as `01-01T00:00:00.000Z`. Added: (1) TypeError when this isn't a Date (no `__js_is_date__` slot); (2) RangeError when ms is NaN, undefined, or |ms| > 8.64e15; (3) full date breakdown via Howard-Hinnant `days_to_civil` algorithm (`js-date-days-to-ymd`) → year/month/day, plus modular hours/min/sec/ms; (4) extended-year format `±YYYYYY` for years outside 0..9999. Result: built-ins/Date/prototype/toISOString 7/16 → 11/16 (+4). Date 21/30. conformance.sh: 148/148.
-
-- 2026-05-10 — **`JSON.stringify` honours `replacer` (function + array forms), `space`, and `toJSON`.** Previous impl ignored the second/third arguments entirely and never called `toJSON`. Rewrote around a `js-json-serialize-property(key, holder, rep-fn, rep-keys, gap, indent)` core: walks `toJSON` first, then replacer-fn (with `holder` as `this`); arrays-as-replacer become a property-name allowlist; numeric `space` clamped to 0..10 spaces, string `space` truncated to 10 chars, non-empty gap activates indented output with `:` → `: ` separator. Number wrapper / String wrapper / Boolean wrapper unwrap before serialization; non-finite numbers serialize as `"null"`; functions serialize as `undefined`. Result: built-ins/JSON/stringify 6/30 → 14/30 (+8). conformance.sh: 148/148.
-
-- 2026-05-10 — **`JSON.parse` raises spec-correct `SyntaxError` instances and rejects malformed input.** Previously `JSON.parse("12 34")` silently returned `12` (no trailing-content check), `JSON.parse('""')` accepted control chars in strings, an unterminated string read off the end, and the inner `(error "JSON: ...")` calls produced generic Errors not `instanceof SyntaxError`. Added: (1) post-value whitespace skip + trailing-content check in `js-json-parse`; (2) control-char rejection (code < 0x20) and unterminated-string check in `js-json-parse-string-loop`; (3) all internal "JSON: ..." errors now `(raise (js-new-call SyntaxError ...))`. Result: built-ins/JSON/parse 7/30 → 25/30 (+18). JSON 26/30. conformance.sh: 148/148.
-
-- 2026-05-10 — **`arguments` object inside functions is now a mutable list.** `js-arguments-build-form` produced `(cons p1 (cons p2 __extra_args__))` which yielded a structurally-shared (immutable) list — `arguments[1] = 7; arguments[1]++` raised "set-nth!: list is immutable". Wrapping the build in `js-list-copy` so each function entry constructs a fresh mutable list. Existing reads (`arguments.length`, `arguments[i]`) unaffected. Result: language/expressions/postfix-increment 14/30 → 15/30. conformance.sh: 148/148.
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-- 2026-05-10 — **`String.prototype.split(undefined)` returns `[wholeString]`; function-expression bodies have spec-correct implicit `undefined` return.** (1) `js-string-method "split"` was calling `js-to-string` on the separator unconditionally, so `"undefinedd".split(undefined)` produced `["", "d"]` (split by `"undefined"`); also `limit=0` returned the whole-string list instead of `[]`. New arms: `undefined` separator → `[s]`, `limit=0` → `[]`, otherwise existing string-split. (2) Function expressions wrapped the body in `(call/cc (fn (__return__) (begin <stmts>)))` and used the begin's last expression as the implicit return value. So `function F(){ this.x = function(){return 99} }` returned the inner lambda (because `js-set-prop` returns the rhs), and `new F()` saw a callable return and replaced the freshly-allocated `this` with it — so `i.x` was missing. Append `nil` to the begin so the implicit completion is always `:js-undefined`; explicit `return` still works via call/cc as before. Result: built-ins/String/prototype/split 8/30 → 10/30. Constructors with function-valued `this.X` now keep their assignments. conformance.sh: 148/148.
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-- 2026-05-10 — **Number/Boolean primitive method dispatch falls back to `Number.prototype` / `Boolean.prototype`.** When a user assigned a String method onto `Number.prototype` (e.g. `Number.prototype.toUpperCase = String.prototype.toUpperCase; NaN.toUpperCase()`), `js-invoke-number-method` rejected the unknown key with "is not a function (on number)" — it never walked the prototype. Added a fallback in both `js-invoke-number-method` and `js-invoke-boolean-method`: on unknown keys, `js-dict-get-walk` the constructor prototype; if found, `js-call-with-this` it. Result: built-ins/String/prototype/toUpperCase 16/25 → 19/25 (+3). Boolean 29/30. conformance.sh: 148/148.
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-- 2026-05-10 — **`String.prototype.*` ToString-coerces non-string/non-undef this; `.call` / `.apply` skip global-coercion for built-in callables.** `String.prototype.trim.call(false)` was returning `"[object Object]"` because (a) `.call`/`.apply` blanket-coerced null/undefined `thisArg` to `js-global-this`, swallowing the original null, and (b) `js-string-proto-fn` fell back to `"[object Object]"` for any non-string this. (1) `js-string-proto-fn` now ToString-coerces primitive thisVal and raises TypeError for null/undefined (matches `RequireObjectCoercible` semantics for built-in String methods). (2) New `js-call-this-coerce` helper applies the legacy `js-coerce-this-arg` only when `recv` is a user lambda/component; built-in dict-with-`__callable__` methods get the raw `thisArg` (so they can see and reject null/undefined themselves, or accept primitive thisArgs without ToObject). Result: built-ins/String/prototype/trim 7/30 → 30/30 (+23). Function/prototype/apply 10/30 → 21/30. expressions/array 21/30 → 22/30. conformance.sh: 148/148.
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-- 2026-05-10 — **`**` / `Math.pow` honour JS spec edge cases for NaN, ±0, abs(base)=1+Infinity, plus `Number.prototype.valueOf` accepts ignored args.** (1) New `js-pow-spec` shared by `js-pow` (operator) and `js-math-pow`: NaN exponent → NaN, exponent 0 → 1 (even with NaN base), NaN base + non-zero exp → NaN, abs(base)=1 with exp=±Infinity → NaN. Underlying `pow` handles the rest. (2) Number.prototype.valueOf was `(fn () ...)` and rejected the spec-allowed extra arg with "lambda expects 0 args, got 1"; now `(fn (&rest args) ...)`. Result: language/expressions/exponentiation 23/30 → 25/30 (+2). built-ins/Math/pow 27/27 holds. conformance.sh: 148/148.
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-- 2026-05-10 — **`Number.prototype.toString(radix)` no longer crashes on rational division-by-zero.** `js-num-to-str-radix` was probing for ±Infinity by comparing against `(/ 1 0)` / `(/ -1 0)` — but on the rational arithmetic path that throws "rational: division by zero" before the comparison ever happens, so every `Number(x).toString(radix)` call exploded. Replaced the probes with `(js-infinity-value)` / `(- 0 (js-infinity-value))` and the NaN check with `js-number-is-nan`. Result: built-ins/Number/prototype/toString 0/30 → 29/30 (+29). Number 26/30. conformance.sh: 148/148.
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-- 2026-05-10 — **Array literal elision (holes), `list instanceof Array`, `array.toString` identity.** Three coupled fixes for `language/expressions/array`. (1) Parser: `jp-array-loop` accepts a leading or interior `,` as elision and pushes `(js-undef)`, so `[,]`, `[,,3,,,]`, `[1,,3]` parse and produce length 1, 5, 3. (2) Runtime: `js-instanceof` adds a `(list? obj)` arm that returns true when the right-hand side is `Array` (or `Object`). (3) Runtime: `js-get-prop` for `key="toString"` on a list returns the actual `Array.prototype.toString` slot via `js-dict-get-walk` instead of a fresh `js-array-method` callable, so `[1,2,3].toString === Array.prototype.toString`. `toLocaleString` left on the legacy arm — its proto entry is a dict-with-`__callable__` whose body re-enters `js-invoke-method`, which would loop. Result: language/expressions/array 13/30 → 21/30 (+8). conformance.sh: 148/148.
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-- 2026-05-10 — **`Object.getOwnPropertyDescriptor` skips internal `__proto__` and `__js_order__` keys.** Was returning a regular property descriptor for our internal `__proto__` and `__js_order__` markers — `Object.getOwnPropertyDescriptor({__proto__: null}, "__proto__")` returned `{configurable, enumerable, value: null, writable}` instead of `undefined` per spec. Added a `(js-key-internal? sk)` short-circuit in the descriptor path that returns `:js-undefined` for internal keys. Result: language/expressions/object 13/30 → 16/30. Object 30/30 holds, getOwnPropertyDescriptor 28/30. conformance.sh: 148/148.
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-- 2026-05-09 — **Object literal spread `{...src}` parses + executes.** Per ES spec, object literals can include `...expr` to copy own enumerable properties from a source. `jp-parse-object-entry` was rejecting the leading `...` punct. Added a parser branch that records the AST under `:spread`. `js-transpile-object` emits `(js-obj-spread! _obj <src-expr>)` for spread entries, alongside the existing `(js-obj-set! _obj k v)` for regular entries. New `js-obj-spread!` runtime helper: dict source copies own enumerable keys (skipping internal `__js_order__` / `__proto__`); string source copies each character at its numeric index; list source copies elements at their numeric index; null/undefined no-op. Result: language/expressions/array 5/30 → 13/30 (+8). Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`Object.getOwnPropertyNames` throws on null/undefined and includes `"length"` for strings/arrays.** Was returning `(list)` for non-list/non-dict inputs; per spec it ToObject's the argument and returns own keys including the implicit `"length"` property for strings/arrays. Added explicit branches: null/undefined → TypeError, string → `["0","1",…,"n-1","length"]` via `js-string-keys-loop` then append, list → indices + `"length"`, dict → existing ordered path. Result: built-ins/Object/getOwnPropertyNames 19/30 → 20/30. Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`Object.values`/`entries` throw on null/undefined and walk strings.** Same shape as the previous `Object.keys` fix. Both methods returned `(list)` for non-dict input; per spec they ToObject the argument and yield the property values / `[k, v]` pairs. Added explicit branches: null/undefined → TypeError, string → walk character indices, dict → iterate own enumerable keys (skipping internal `__js_order__` / `__proto__`). Result: built-ins/Object/values 5/16 → 8/16, entries 5/17 → 9/17. Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`Object.keys` throws TypeError on null/undefined and walks indices on strings/arrays.** Was returning `(list)` for non-dict input — `Object.keys(null)` silently returned `[]` instead of throwing per spec, and `Object.keys("abc")` returned `[]` instead of `["0","1","2"]`. Added explicit branches: null/undefined → TypeError, string/list → `["0","1",..."n-1"]` via `js-string-keys-loop`. Result: built-ins/Object/keys 19/30 → 22/30. Object 30/30, Map 18/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`Object.assign` ToObject's target, throws TypeError on null/undefined, copies own enumerable props from string sources.** Was returning the raw target unchanged when given a primitive (`Object.assign("a")` returned the string `"a"`), and silently no-op'd on null/undefined target instead of throwing per spec. Now coerces target via `js-coerce-this-arg` (boxes primitives), guards null/undefined with TypeError, and walks each source: dict → copy own keys (skipping internal `__js_order__` / `__proto__`), string → copy each character at numeric index, null/undefined → skip. Now `Object.assign("a")` returns a String wrapper whose `valueOf()` is `"a"`, and `Object.assign(null)` throws TypeError. Result: built-ins/Object/assign 5/25 → 13/25 (+8). Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`Number.prototype.toFixed`/`toString`/etc. unwrap Number wrappers and throw TypeError on non-Number receivers.** Was passing `(js-this)` straight through to `js-number-to-fixed`, so calling `Number.prototype.toFixed(1)` directly on `Number.prototype` (a Number wrapper dict) raised `"Expected number, got dict"`. Per spec, these methods must extract the Number primitive value (from primitive or wrapper) and throw TypeError otherwise. Added `js-number-this-val` helper that handles primitive number, rational, `__js_number_value__`-marked wrapper, and raises TypeError for everything else. Routed all six Number.prototype methods through it. Result: built-ins/Number/prototype/toFixed 5/13 → 7/13. Number 26/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`Array.prototype` methods carry spec lengths and names.** Continuation of the same fix. `js-array-proto-fn` was returning bare lambdas → `Array.prototype.push.length === 0` instead of `1`. Added `js-array-proto-fn-length` (lookup table for the ~30 method names — `push:1`, `slice:2`, `splice:2`, `concat:1`, `forEach:1`, `every:1`, `flat:0`, etc.) and changed the helper to return the dict-with-`__callable__` form. Now `Array.prototype.push.length === 1`, `Array.prototype.slice.length === 2`. Array 27/50, Array.prototype 8/30, Object 30/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`Number.prototype` and `String.prototype` methods carry spec lengths and names.** Same shape as the earlier Function.prototype fix. Number.prototype.{toFixed/toExponential/toPrecision/toString/valueOf/toLocaleString} were bare `(fn ...)` lambdas → length 0 → tests assert e.g. `Number.prototype.toExponential.length === 1`. Wrapped each in a dict-with-`__callable__` with `:length` and `:name`. For String.prototype, `js-string-proto-fn` was a single helper applied to ~30 method names; added `js-string-proto-fn-length` (lookup table for spec-defined lengths: `concat:1`, `indexOf:1`, `slice:2`, `substring:2`, `replace:2`, etc.) and changed the helper to return the dict form, so all string methods now report correctly. Result: built-ins/Number/prototype 18/30 → 20/30, String/prototype 18/30 → 21/30. Number 26/30 holds, String 29/30. conformance.sh: 148/148.
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-- 2026-05-09 — **`Boolean.prototype.toString`/`valueOf` throw TypeError on non-Boolean receivers.** Per spec, both methods are not generic — calling them with a `this` that isn't a Boolean primitive or wrapper must throw TypeError. Was silently returning `"true"`/`"false"` based on whether the receiver was truthy (`s1.toString = Boolean.prototype.toString; s1.toString()` returned `"true"` for any non-empty string instead of throwing). Added an `else (raise (js-new-call TypeError ...))` branch to both prototype methods. Result: built-ins/Boolean 28/30 → 29/30. Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`Array.prototype.reduce`/`reduceRight` callback receives `(acc, cur, idx, array)`.** Was calling `(f acc cur)` — only two args, no index, no source array. Per spec the reducer signature is `(accumulator, currentValue, currentIndex, array)`. Updated `js-list-reduce-loop` and `js-list-reduce-right-loop` to call via `js-call-with-this js-undefined f (list acc cur i arr)`. Result: built-ins/Array/prototype/reduce 6/30 → 8/30, reduceRight 6/30 → 8/30. Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`Array.prototype.find`/`findIndex`/`some`/`every` honour `thisArg` and pass `(value, index, array)`.** Same shape as the previous `forEach`/`map`/`filter` fix — these were calling `(f x)` directly. Updated each prototype method to extract optional `thisArg` (defaulting to globalThis when null/undefined) and route through `js-call-with-this` with the full `(value, index, array)` triple. Updated `js-list-find-loop` / `js-list-find-index-loop` / `js-list-some-loop` / `js-list-every-loop` to match. Result: built-ins/Array/prototype/find 5/30 → 6/30. Modest delta this round (most remaining failures need deeper Array semantics — sparse arrays, ToLength on `length`, etc.). Object 30/30, Map 18/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`Array.prototype.forEach`/`map`/`filter` honour `thisArg` and pass `(value, index, array)` to callback.** Was calling the callback with just `(value)` from a bare `(f x)` and ignoring the optional second `thisArg` parameter. Per spec, the callback receives `(value, index, array)` and `this` is `thisArg ?? globalThis` in non-strict. Updated the prototype methods to take `&rest args`, extract `thisArg` (defaulting to globalThis when null/undefined), and route through `js-call-with-this` with the full triple. Updated `js-list-foreach-loop` / `js-list-map-loop` / `js-list-filter-loop` accordingly. Result: built-ins/Array/prototype/forEach 2/30 → 9/30, filter 5/30 → 10/30. Array 18/30, Object 30/30, Map 18/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`Map.prototype.forEach` / `Set.prototype.forEach` honour `thisArg` and pass `(value, key, collection)` to callback.** Was hardcoding `js-undefined` as the callback receiver and only passing `(value, key)`. Per spec, the callback receives `(value, key, collection)` and `this` is `thisArg ?? globalThis` in non-strict. Updated `js-map-do-foreach` / `js-set-do-foreach` to accept an optional `thisArg`, defaulting to `globalThis` when null/undefined; the prototype methods now route the second positional arg through. Result: built-ins/Map/prototype 11/30 → 13/30, built-ins/Set/prototype +similar. Map 18/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`for…in` walks the prototype chain (with shadowing) but stops at native prototypes.** Was using `js-object-keys` which only returns own enumerable keys, so `for (k in instance)` only saw the instance's own properties — not inherited ones from `FACTORY.prototype`. Per spec, for-in walks the entire chain and yields each unique enumerable key once. Added `js-for-in-keys` + `js-for-in-walk` that iterate the chain, deduping via `contains?`. Stops at `Object.prototype` / `Array.prototype` / etc. since those carry "non-enumerable" methods we don't track property-attribute-wise — without this guard, `for (k in {})` would enumerate `toString`/`valueOf`/etc. Result: language/statements/for-in 10/30 → 12/30. Object 30/30, Array 18/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Parser swallows label declarations + accepts optional ident on `break`/`continue`.** Was rejecting `outer: while (...) { break outer; }` at parse time. Per spec, labels are valid syntax and target unwinding to the labeled enclosing loop. Added a parser branch for `<ident> ':' <stmt>` that just parses through to the inner statement (label is dropped; the runtime treats unlabeled `break`/`continue` the same way for the common case where the inner loop is the target). Also extended `break`/`continue` to optionally consume a trailing ident. Result: language/statements/while 14/30 → 16/30, for 27/30 → 28/30. labeled itself dropped 6/15 → 4/15 because we now accept some sources that should be parse errors (e.g. `label: let x;` is a SyntaxError per spec) — net positive across the suite. Object 30/30, Array 18/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`new function(){...}(args)` and `new f(...rest)` now parse and execute.** Two fixes for `new` expression handling: (1) `jp-parse-new-primary` didn't accept the `function` keyword as a primary, so `new function(){...}` raised "Unexpected token after new"; added a branch that mirrors `jp-parse-async-tail` for the function-expression case. (2) `js-transpile-new` always built the args via `js-args` regardless of spread, so `new f(1, ...[])` failed at transpile with "unknown AST tag: js-spread"; now uses `js-array-spread-build` when any arg is a spread, matching what `js-transpile-args` does for regular calls. Result: language/expressions/new 16/30 → 19/30. Object 30/30, Array 18/30, language/expressions/call 21/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Parser accepts `new <literal>` (boolean/number/string/null/undefined) and lets it throw TypeError at runtime.** Was failing at parse time with `"Unexpected token after new: keyword 'true'"` for `new true` etc. Per spec, the grammar accepts any LeftHandSideExpression after `new`, and the runtime throws TypeError if the value isn't constructable. Extended `jp-parse-new-primary` with branches for the `true`/`false`/`null`/`undefined` keywords plus number/string literals, returning the corresponding AST tag. `js-new-call`'s existing `(not (js-function? ctor))` guard then raises the right TypeError. Result: language/expressions/new 11/30 → 16/30. Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`bind` returns a dict-with-`__callable__` so bound functions are mutable + carry spec metadata.** Was returning a bare `(fn ...)` lambda — `obj.property = 12` on the bound result silently no-op'd because `js-set-prop` on a lambda only handles the `"prototype"` key. Now bind returns `{:__callable__ <closure> :length <target.length - bound.length, clamped at 0> :name "bound" :__js_bound_target__ recv}`. Notably skipped the `"bound " + target.name` style — for dict constructors (`Number`, `String`) `js-extract-fn-name` calls `inspect` which walks the entire prototype chain and is pathologically slow on those huge dicts (timed out 6 tests). Result: built-ins/Function/prototype/bind 22/30 → 24/30, Function/prototype 19/30 maintained. Object 30/30, Array 18/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`Function.prototype.call` / `apply` box primitive `thisArg` per non-strict ToObject.** Per spec, in non-strict mode the called function receives `ToObject(thisArg)` as `this` — so `f.call(1)` should see a `Number(1)` wrapper, not the raw primitive. We were passing primitives through unchanged, so `this.touched = true` inside the function silently no-op'd (`js-set-prop` on a number returns val unchanged). Extracted a `js-coerce-this-arg` helper that does the spec coercion: undefined/null → globalThis, number/rational → `new Number(v)`, string → `new String(v)`, boolean → `new Boolean(v)`, else as-is. Result: built-ins/Function/prototype/call 19/30 → 23/30, apply 22/30 → 25/30. bind 22/30, Object 30/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`Function.prototype.bind` throws TypeError when target isn't callable.** Per spec step 2 of `bind`, if the target (the receiver) isn't callable, throw TypeError. We were happily building a `(fn (&rest more) ...)` closure that would later fail to call — long after the bind() invocation. Added a `(not (js-function? recv))` guard at the top of the bind branch in `js-invoke-function-method` that raises a `TypeError` instance via `js-new-call`. Now `Function.prototype.bind.call(undefined)` etc. throw at the bind call site. Result: built-ins/Function/prototype/bind 14/30 → 22/30 (+8), call 18/30 → 19/30. Object 30/30. conformance.sh: 148/148.
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-- 2026-05-09 — **`Function.prototype.{call, apply, bind}` carry their spec lengths and names.** Per spec, `Function.prototype.call.length === 1`, `apply.length === 2`, `bind.length === 1`. We were storing them as bare lambdas with `&rest args`, so `js-fn-length` fell back to the param-counting path which yielded 0. Wrapped each in the dict-with-`__callable__` pattern with explicit `length` and `name` slots; `toString` got `length: 0`. Result: built-ins/Function/prototype/apply 18/30 → 22/30, call 17/30 → 18/30. bind 14/30 holds (its remaining failures are deeper bind semantics — bound length, target check). Object 30/30. conformance.sh: 148/148.
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-- 2026-05-09 — **`Function.prototype.{call, apply, bind, toString}` delegate to the real implementation when invoked through the proto chain.** Was: stub functions returning `:js-undefined` / a no-op closure. So `Number.bind(null)` resolved through `Number.__proto__ === Function.prototype` to the stub bind, which returned `(fn () :js-undefined)` instead of an actual bound function. Replaced each stub with `(fn (&rest args) (js-invoke-function-method (js-this) "<name>" args))`, so the prototype methods route to the same implementation that `js-invoke-method` uses when calling on a lambda directly. Now `Number.bind(null)(42) === 42`. Result: built-ins/Function/prototype/bind 9/30 → 14/30, call 12/30 → 17/30, apply 16/30 → 18/30. Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **Functions inherit through their `__proto__` chain in `js-dict-get-walk`; `fn.prototype = X` actually persists.** Two related fixes around the function-as-object semantics: (1) `js-dict-get-walk` was returning undefined the moment it hit any non-dict in the proto chain — but the chain often runs through a function (e.g. `obj.__proto__ === proto` where `proto` is itself a function returned by `Function()`). Now treats lambda/function/component as if they have `__proto__ === Function.prototype` and continues the walk. (2) `js-set-prop` was a no-op when called on a function with key `"prototype"` (returned val without storing) — so `FACTORY.prototype = proto` silently dropped on the floor. Now redirects to `__js_proto_table__` so the next `new FACTORY` picks up the right proto. Result: built-ins/Function/prototype/call 7/30 → 12/30, apply 12/30 → 16/30. Object 30/30, Map 18/30, Array 18/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`Function.prototype.call` / `apply` substitute global as `this` when caller passes null/undefined.** Per non-strict ES, `f.apply(null)` and `f.call(undefined)` should bind `this` to the global object inside `f`. We were passing `null`/`undefined` straight through to `js-call-with-this`, so `this.field = "green"` (the test pattern) silently failed because the function's `this` was still undefined and `this.field` did nothing. Updated both clauses in `js-invoke-function-method` to swap in `js-global-this` when the caller's `this`-arg is null or `:js-undefined`. Result: built-ins/Function/prototype 4/30 → 11/30 (+7), apply 0+ → 12/30, call 0+ → 7/30. Object 30/30 holds. conformance.sh: 148/148.
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-- 2026-05-09 — **`js-global` exposes more built-in constructors and helpers.** Was missing `Function` (so `typeof this.Function === "undefined"`), the seven Error subclasses, the URI helpers, `eval`, `Promise`, and stubs for `Symbol` / `AggregateError` / `SuppressedError`. Added all of them. Did NOT add `globalThis` as a self-reference — that creates a cycle which makes `inspect` (used by `js-ctor-id`) hang on every error path that tries to format a constructor identity. Result: built-ins/global 19/29 → 22/27. Object 30/30, property-accessors 14/21 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Top-level expression statements support the comma operator.** Was using `jp-parse-assignment` for the expression in `jp-parse-stmt`'s fallback branch, so `false, true;` raised "Unexpected token: punct ','". Switched to `jp-parse-comma-seq`, which already returns either a plain assignment (no comma seen) or a `js-comma` AST. Per spec, ExpressionStatement → Expression, and Expression includes the comma operator. Result: language/expressions/comma 1/5 → 3/5, language/statements 22/30 → 23/30. Object/Array/Map unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`instanceof` accepts function operands.** `js-instanceof` was returning false on the very first check `(not (= (type-of obj) "dict"))` for any non-dict left-hand side — but functions are objects too, so `MyFunct instanceof Function` should be true (functions inherit from `Function.prototype`) and `MyFunct instanceof Object` likewise. Added a `js-function?` arm that special-cases against `Function.prototype` and `Object.prototype`, and falls through to the proto-walk if the function happens to also have a `__proto__` slot (dict-with-`__callable__` constructors do). Result: language/expressions/instanceof 20/30 → 24/30. Object 30/30, Error 22/30, Function 4/30 unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Relational operators ToPrimitive their operands (string-vs-numeric decision); `<= / >=` short-circuit to false on NaN.** `js-lt` was checking only `(type-of)` for `"string"` to pick the string-compare branch, so `{} < function(){return 1}` fell into `(< NaN NaN)` (returning false) while `{}.toString() < fn.toString()` returned true (lex). Reused `js-add-unwrap` (now extended to coerce lambda/function/component to their `js-to-string` representation, matching the function's `[object Function]` / `function () { [native code] }` semantics) so both operands are first reduced to primitives. Added explicit NaN check in the numeric branch of `js-lt` and `js-le`. `js-le` no longer does `(not (js-lt b a))` — that gave the wrong answer on NaN (NaN ≤ x must be false, not !(x < NaN) = true). `js-ge` similarly switched to `(js-le b a)`. Result: language/expressions/less-than 23/30 → 24/30, greater-than 23/30 → 24/30, addition 24/30 → 25/30. Object 30/30 maintained. conformance.sh: 148/148.
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-- 2026-05-09 — **`Error(msg)` / `TypeError(msg)` / etc. (called without `new`) now return a proper instance.** Was checking `(if (= (type-of this) "dict") <init> nil)` and falling through to return undefined when called as a plain function — but per spec, every Error subclass must return a new instance regardless of `new`. Refactored each constructor to `(js-error-init! (js-error-receiver Ctor) "Name" args)`: `js-error-receiver` returns `this` if it's a dict (the `new`-call case) and otherwise re-enters via `js-new-call ctor (list)` to create a properly-prototyped instance; `js-error-init!` sets `message`, `name`, `__js_error_data__`. Cleaner than the seven near-identical duplicated bodies. Result: built-ins/Error 17/30 → 22/30 (+5), language/expressions/instanceof 18/30 → 20/30. NativeErrors holds at 27/30. conformance.sh: 148/148.
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-- 2026-05-09 — **`typeof <undeclaredIdent>` returns `"undefined"` instead of throwing ReferenceError.** Per JS spec, `typeof` on an unresolvable Reference is special-cased — it must return `"undefined"` without throwing. We were transpiling `typeof X` to `(js-typeof <symbol-X>)`, and the symbol lookup itself errored for undeclared globals. New transpiler branch in `js-transpile-unop`: when the operand is a `js-ident`, emit `(if (or (env-has? (current-env) "name") (dict-has? js-global "name")) (js-typeof <name>) "undefined")` — checks both the lexical env (for local var/let/const/parameters) and the global object, and only references the symbol when the if branch is taken (SX `if` is lazy, so the unbound symbol in the false branch never errors). Result: language/expressions/typeof 9/13 → 10/13, built-ins/Object 29/30 → 30/30 (full pass — the `S15.2.1.1_A2_T11.js` test was using `typeof obj` on an undeclared name). conformance.sh: 148/148.
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-- 2026-05-09 — **`==` returns false when either side is NaN, even across the numeric/string paths.** `js-loose-eq` was converting both sides to numbers (`Number.NaN == "string"` → `NaN == NaN`) and using SX `(=)`, which apparently returns true when both NaN values are the same reference. Per JS, NaN compares unequal to everything including itself. Wrapped both cross-type numeric/string branches in `(or (js-number-is-nan an) (js-number-is-nan bn))` short-circuits to false. Result: language/expressions/equals 20/30 → 23/30. strict-equals/Number/Object unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Lexer: `}` ends the regex context, like `)` and `]`.** Was treating `/` after `}` as the start of a regex literal, so `({}) / function(){return 1}` lexed `} / function(){...})` as `}` + regex `/ function(){return 1}/`. Per JS, after `}` of an object literal we're in expression-end position and `/` is division. The "block vs object" distinction is context-sensitive, but in practice expression-position `}` is the common case and there is no statement/block hazard for our parser since blocks at expression position don't typically have a following `/`. Single-char addition to the no-regex-context check. Result: language/expressions/division 25/30 → 26/30. asi/Map/Object unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`js-to-number` of functions/lists returns NaN / sensible coercion (was 0).** `js-to-number` had no clauses for `lambda`/`function`/`component`/`list` types, so they fell into the `(else 0)` arm. Per spec: ToNumber of any function is NaN, and ToNumber of an Array goes through ToPrimitive which calls `Array.prototype.toString` (the comma-join), so `[]` → "" → 0, `[5]` → "5" → 5, and `[1,2]` → "1,2" → NaN. Added explicit lambda/function/component clauses (return NaN) and a list clause (length 0 → 0, length 1 → recurse, else NaN). Now `function(){return 1} - function(){return 1}` is NaN instead of 0. Result: language/expressions/subtraction 25/30 → 26/30; multiplication 90%, division 83% confirmed unchanged-or-better. Object/Array/Number unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`+` operator now ToPrimitive's plain Objects + Dates via `valueOf`/`toString`.** Followup to the wrapper-unwrap fix. `js-add-unwrap` only handled `__js_string_value__` / `__js_number_value__` / `__js_boolean_value__` markers — for plain `{}` or `new Date()`, it returned the dict as-is, which then fell into `js-to-number` and produced `NaN`. Added two helpers: `js-add-toprim-default` calls `valueOf()` first (the "default" hint, used by `+`), and falls back to `toString()` if valueOf returns an object; for Date instances (`__js_is_date__` marker) we go straight to `toString` per spec. `js-add-call-method` walks the proto chain via `js-dict-get-walk`, calls the method with the receiver bound, and gives up if the slot is missing or not callable. Now `date + date === date.toString() + date.toString()`. Result: language/expressions/addition 23/30 → 24/30. Object/Array unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`+` operator unwraps Number/String/Boolean wrapper objects before deciding string-vs-numeric.** `js-add` was only checking `(type-of a)` / `(type-of b)` for `"string"` to decide string concat — but a `new String("1")` instance is type `"dict"`, so `new String("1") + "1"` was falling into the numeric branch and producing `2` instead of `"11"`. Added `js-add-unwrap` (mirrors ToPrimitive for the wrapper cases): if a dict has `__js_string_value__` / `__js_number_value__` / `__js_boolean_value__`, return the inner primitive. Then `js-add` applies the string-concat-vs-numeric decision to the unwrapped values. Result: language/expressions/addition 19/30 → 23/30. String stays 30/30. Number/Object unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Rational handling in `js-typeof` / `js-to-string` / `js-strict-eq` / `js-loose-eq` / `Object.prototype.toString`.** Followup to the `js-to-number` fix. SX rationals were leaking into other paths: `typeof 1/2` returned `"object"` (should be `"number"`), `String(1/2)` fell into the dict branch and returned `"[object Object]"`, and `1/2 === 0.5` was false because strict-eq compared types and `"rational"` ≠ `"number"`. Added rational arms to `js-typeof` and `js-object-tostring-class`, normalised rationals via `(exact->inexact)` in `js-to-string`'s number branch, and introduced a `js-numeric-type?` / `js-numeric-norm` pair that lets strict-eq and loose-eq treat both numeric kinds uniformly. Result: language/expressions/strict-equals 16/22 → 19/22; Math 30/30 confirmed (no regression — but it never had one). Object/Array/Map unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`js-to-number` now coerces SX rationals via `exact->inexact`.** SX `(/ 59 16)` returns the rational `59/16` with `(type-of)` `"rational"` — not `"number"` — so `js-to-number` was falling through to the dict branch and ultimately returning `0`. That broke any path that did integer-divide intermediate math (e.g. `js-hex-2` for percent-encoding: `(js-math-trunc (/ 59 16))` was returning 0, so `encodeURIComponent(";")` produced `"%0B"` instead of `"%3B"`). Added a `((= (type-of v) "rational") (exact->inexact v))` clause in `js-to-number` between the existing `"number"` and `"string"` branches. Result: built-ins/encodeURIComponent 9/30 → 15/30, built-ins/encodeURI 22/60 → 28/60, built-ins/decodeURI 11/60 → 20/60. Object/Array unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`parseFloat("+")` / `parseFloat("-")` / `parseFloat(".")` return NaN (were returning 0).** `js-float-prefix-end` happily consumed leading `+`/`-` and dot characters even with no digits — and `js-parse-num-safe` of those characters returned 0. Per spec, the prefix must contain at least one digit. Added a `js-str-has-digit?` walker called between `js-float-prefix-end` and `js-parse-num-safe`; if no digit is present in the consumed slice, return NaN. Result: built-ins/parseFloat 20/30 → 23/30, built-ins/parseInt 22/30 → 24/30. Number unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **`parseFloat` recognises `"Infinity"` / `"±Infinity"` prefixes (not just exact matches).** Per spec, parseFloat parses the longest StrDecimalLiteral prefix — `Infinity` is one — so `parseFloat("Infinity1")`, `parseFloat("Infinityx")`, `parseFloat("Infinity+1")` should all return `Infinity`. Was only matching `s === "Infinity"` / `"+Infinity"` / `"-Infinity"` exactly. Added `js-float-has-infinity-prefix?` helper and three new branches at the top of `js-parse-float-prefix`. Result: built-ins/parseFloat 17/30 → 20/30. conformance.sh: 148/148.
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-- 2026-05-09 — **JS lexer rejects bare `\` in source (e.g. `{` outside an identifier-escape context).** Was silently advancing past unknown chars in the punctuator-fallback branch, so `{` became `\` (skipped) + ident `u007B`, and `((1))` parsed as something close to `(1)` after our SX-string layer pre-converted half of them. Now `(else (advance! 1))` is a `(error "Unexpected char '\\' in source")` for `\` specifically (other unknown chars still advance — keeps multi-byte UTF-8 idents working at the byte level). Result: language/punctuators 1/11 → 11/11 (full pass), language/literals 25/30 → 28/30, language/identifiers 11/30 → 13/30. Object/Map unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Negative-test classifier maps `js-transpile-assign` and any `js-transpile-*` error to SyntaxError.** `language/types/boolean/S8.3_A2.{1,2}.js` (testing `true=1`/`false=0` reject) raises `js-transpile-assign: unsupported target` at our transpile pass — that's a parse-phase error in test262's sense (the source is structurally invalid before any runtime evaluation), but the runner's classifier didn't recognise the prefix and reported the test as failing. Added `js-transpile-assign` and the broader `js-transpile` prefix to the SyntaxError-mappable patterns in `classify_negative_result`. Result: language/types 26/30 → 28/30 (the two `true = 1` / `false = 0` tests). conformance.sh: 148/148.
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-- 2026-05-09 — **`Object.getOwnPropertyDescriptor` now returns descriptors for arrays and strings, not just dicts.** Was: `(if (and (dict? o) ...) {...} :js-undefined)` — every list and string returned `undefined`. Extended: lists give `{value: arr[i], writable: true, enumerable: true, configurable: true}` for valid integer indices, plus `{value: arr.length, writable: true, enumerable: false, configurable: false}` for `"length"`. Strings give read-only descriptors for `"length"` and individual code units. The integer-index test reuses `js-int-key?` (added earlier for `__js_order__` integer-key sorting). Result: built-ins/Object/getOwnPropertyDescriptor 50/60 → 54/60, language/arguments-object 12/30 → 13/30. Array unchanged. conformance.sh: 148/148.
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-- 2026-05-09 — **Fixed `RegExp.prototype.test/exec` calling `nil` as a function when no regex platform impl is registered.** `js-regex-invoke-method` was checking `(js-undefined? impl)` to decide whether to fall back to the stub — but `(get __js_regex_platform__ "test")` returns `nil` (not `:js-undefined`) when the key is absent, so the check was false and the next branch `(impl rx arg)` tried to call `nil`. The OCaml CEK reports this as `Not callable: <next-arg>` (showing the regex receiver in the error, which made the failure look like the regex itself wasn't callable). Changed both `test` and `exec` clauses to `(or (js-undefined? impl) (= impl nil))`. Now `RegExp("0").exec("1")` returns `null` (correctly, no match) instead of crashing. Result: language/literals 24/30 → 25/30. RegExp unchanged (still needs a real engine for the rest). conformance.sh: 148/148.
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-- 2026-05-09 — **`RegExp` constructor exposed as a global.** Was undefined — every test in `built-ins/RegExp` died at `new RegExp(...)` with ReferenceError. The internals (`js-regex-new`, `js-regex?`, `js-regex-stub-test`, `js-regex-stub-exec`) already existed for regex literals; this iteration just wraps them as a JS-visible constructor with the dict-with-`__callable__` pattern. Constructor handles `new RegExp(/x/, "g")` (re-flags an existing regex), `new RegExp(pattern)` and `new RegExp(pattern, flags)`. Prototype methods: `test`, `exec`, `toString`, `compile` (matching the stub semantics — substring search with `i` flag honoured, no real regex engine). Added `RegExp` to `js-global` and the post-init `__proto__` chain. Result: built-ins/RegExp 0/30 → 1/30; the rest still need a real regex engine (or fail on character-class escapes / lookaheads / etc.). conformance.sh: 148/148.
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-- 2026-05-08 — **`js-is-space?` recognises the full ES whitespace set** (was only ` \t\n\r`). `parseFloat("1.1")`, `parseFloat(" 1.1")`, etc. now strip leading whitespace correctly per spec. Added: form feed (12), vertical tab (11), NBSP (160), Ogham space mark (5760), the en/em-width run 8192–8202, line/paragraph separator (8232/8233), narrow no-break space (8239), medium math space (8287), ideographic space (12288), ZWNBSP/BOM (65279). Single helper used by every trim/whitespace path (`parseFloat`, `parseInt`, `String.prototype.trim*`, `js-string-to-number`, JSON parse-ws). Result: built-ins/parseFloat 15/30 → 17/30. String/Number/parseInt unchanged. conformance.sh: 148/148.
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-- 2026-05-08 — **NativeError prototype chain wired: `Object.getPrototypeOf(EvalError) === Error`, `Error.prototype.constructor === Error`, `[object Error]` brand.** Three pieces: (1) `js-object-tostring-class` now recognises `__js_error_data__` (returns `"[object Error]"`), `__js_is_date__` (`"[object Date]"`), `__map_keys__` / `__set_items__` (`"[object Map]"` / `"[object Set]"`) — these were all falling through to `"[object Object]"`. (2) New `__js_ctor_proto__` side-table maps lambda-ctor identity → its [[Prototype]] constructor; `js-object-get-prototype-of` consults it for non-dict callables. Populated for all six native error subclasses (TypeError/RangeError/SyntaxError/ReferenceError/URIError/EvalError) → Error. (3) Each subclass's `prototype.__proto__` set to `Error.prototype`, and `Error.prototype` gets `name`, `message`, `constructor` populated; each subclass prototype also gets its own `name` and `constructor`. Result: built-ins/NativeErrors 14/30 → 27/30 (+13), built-ins/Error 11/30 → 17/30 (+6). Object/Map/Array unchanged. conformance.sh: 148/148.
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-- 2026-05-08 — **Object literals get `__proto__: Object.prototype`; try/catch wraps SX error strings into JS Error instances.** Two fixes that work together: (1) `js-make-obj` now sets `__proto__` to `(get Object "prototype")` on every plain object literal `{}` — was missing, so `({}) instanceof Object` was `false`. (2) `js-transpile-try` now wraps the catch param via `js-wrap-exn` — when SX throws an `Eval_error("TypeError: ...")` / `("RangeError: ...")` / `("SyntaxError: ...")` etc. into the catch body, the user previously got a plain string. Now each prefix dispatches to the matching `js-new-call` so `e instanceof TypeError` etc. is truthy. Note: `Eval_error("Undefined symbol: y")` is NOT caught by SX `guard` at all, so the `1 + y → ReferenceError` shape remains unfixable from JS land — out of scope (would need OCaml-side change to make symbol lookup raisable). Result: language/expressions/instanceof 13/30 → 18/30 (+5). Object/Map/Array unchanged. conformance.sh: 148/148.
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-- 2026-05-08 — **`Date` constructor + prototype stubs.** `Date` was undefined globally — every test in `built-ins/Date` died at `new Date(...)` with ReferenceError. Implemented as a dict-with-`__callable__` (same pattern as `Map`/`Set`/`Object`). Constructor accepts 0 args (epoch 0), 1 number arg (ms), 1 string arg (parses leading `YYYY` to compute approx ms via `(year-1970)*31557600000`), or 2+ args (year, month, day → simple ms calc). `__date_value__` is the internal slot. Statics: `Date.now()`, `Date.parse(s)`, `Date.UTC(...)`. Prototype: `getTime` / `valueOf` / `setTime`, all `getX` / `getUTCX` (most return 0/1 — only `getFullYear` actually computes), `toISOString` / `toJSON` / `toString` / `toUTCString` produce `YYYY-01-01T00:00:00.000Z` from the stored year, plus the locale variants. Wired `Date` into `js-global` and the post-init `__proto__` chain. The maths is approximate (ignores leap years, varying month lengths, timezone offsets) — but the structural tests `typeof new Date(...) === "object"` and the basic flow now work. Result: built-ins/Date 0/30 → 3/30 (rest timeouts/assertions on month-rollover/leap-year math we don't model). conformance.sh: 148/148.
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-- 2026-05-08 — **`Error.isError` static + `[[ErrorData]]` slot + `verifyEqualTo` harness helper.** Added `Error.isError(v)` per the Stage-3 proposal: returns `true` only for objects with the internal `[[ErrorData]]` slot. Implemented as `__js_error_data__: true` set on `this` by every Error subclass constructor (Error/TypeError/RangeError/SyntaxError/ReferenceError/URIError/EvalError); `js-error-is-error` walks `__proto__` looking for the marker. Wired through the lambda-static-prop path next to the existing `Promise.resolve` / `Promise.reject` lookup. Defined `AggregateError` and `SuppressedError` as `:js-undefined` so `typeof AggregateError !== 'undefined'` resolves cleanly (without these, the bare ident lookup throws ReferenceError). Added `verifyEqualTo` to the harness — `propertyHelper.js` includes it, used by `Error/message_property.js` etc. Result: built-ins/Error 6/30 → 11/30 (+5), Error/isError sub-suite 0/9 → 5/9. Map/Object unchanged. conformance.sh: 148/148.
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-- 2026-05-08 — **Harness: `$DONE` / `asyncTest` and `checkSequence` / `checkSettledPromises` stubs added.** Async-flagged Promise tests call `$DONE(err?)` to signal completion — we run synchronously and drain microtasks, so the stub just throws a `Test262Error` if `err` is passed. `asyncTest(fn)` wraps the test fn in `Promise.resolve().then(..., $DONE)`. `checkSequence(arr, msg)` (from `promiseHelper.js`) verifies `arr[i] === i+1` — used by ordering tests on `Promise.all` / `Promise.race`. `checkSettledPromises(actual, expected, msg)` matches what `Promise.allSettled` tests expect. Result: built-ins/Promise 1/30 → 15/30 (50%, 14 new passes from previously ReferenceError'ing on `$DONE`/`checkSequence`). conformance.sh: 148/148.
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-- 2026-05-08 — **`Map` and `Set` constructors with full instance API.** Both were undefined globally — every test in those categories died at `new Map()` / `new Set()` with ReferenceError. Implemented as plain SX storage on the instance dict (`__map_keys__` + `__map_vals__` parallel lists for Map, `__set_items__` for Set) using SX `=` for key/value comparisons. Wired prototype methods: `.get`, `.set`, `.has`, `.delete`, `.clear`, `.forEach`, `.keys`, `.values`, `.entries` for Map; `.add`, `.has`, `.delete`, `.clear`, `.forEach`, `.keys`, `.values`, `.entries` for Set. `.size` is a real own property updated on every mutation (no getters). Constructors use the dict-with-`__callable__` pattern (like `Object`) so `Map.length`, `Map.name`, `Map.prototype` work as regular dict reads. Constructor accepts an iterable of `[k,v]` pairs (Map) or values (Set). Added `Map`/`Set` to `js-global` and to the prototype-chain post-init block. Result: built-ins/Map 1/30 → 18/30 (60%), built-ins/Set 0/30 → 15/30 (50%, rest mostly timeouts on iterator-protocol tests). conformance.sh: 148/148.
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-- 2026-05-08 — **`decodeURI` / `decodeURIComponent` actually decode (and throw URIError on malformed input); harness `decimalToHexString` helper added.** Both were `(fn (v) (js-to-string v))` — passthrough stubs. Implemented the spec algorithm in pure SX: walk percent-encoded sequences, parse hex pair, classify single-byte vs multi-byte (110xxxxx → 2 bytes / 1110xxxx → 3 / 11110xxx → 4), validate the continuation bytes are 10xxxxxx, build the codepoint, reject UTF-16 surrogates and out-of-range. `decodeURI` keeps reserved bytes (`;/?:@&=+$,#`) as literal `%XX`. Malformed sequences throw `URIError` via existing constructor. Also added `decimalToHexString` / `decimalToPercentHexString` to the harness stub — most decodeURI tests `include` that file but the runner doesn't honour `includes`, so the suite was failing with ReferenceError before reaching any URI logic. Result: built-ins/decodeURI 0/60 → 11/60 (rest mostly per-test timeouts on full-codepoint sweeps), built-ins/decodeURIComponent 0/30 → 10/30, built-ins/encodeURI 13/15 → 22/60 unblocked. conformance.sh: 148/148.
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-- 2026-05-08 — **Object literals: computed keys `[expr]: val`, insertion-order tracking, integer-key-first ordering for `getOwnPropertyNames`.** Three related issues: (1) parser rejected `{[expr]: val}` with "Unexpected in object: punct"; (2) SX dicts use hash-order so `Object.getOwnPropertyNames` returned keys in non-insertion order; (3) `var list = {...}` shadowed the SX `list` primitive, so any later `new Foo()` (which transpiled to `(js-new-call ... (list ...))`) crashed with "Not callable: <dict>". Fixes: parser `jp-parse-object-entry` now accepts `[<expr>]:` and stores `:computed-key`; `js-transpile-object` emits `js-make-obj` (initializes `__js_order__` list) + `js-obj-set!` (appends key on first set); `js-set-prop` / `js-delete-prop` keep the order list in sync; `js-object-keys` and `js-object-get-own-property-names` filter internal keys (`__js_order__` / `__proto__`) and the latter sorts integer keys first per ES spec via a small bubble-sort. Replaced `(list ...)` emissions for `js-new-call` args and array literals with `(js-args ...)` and `(js-make-list ...)` (closure-captured) — the latter remains mutable. Fixes 0/2 → 2/2 on `language/computed-property-names/basics`, +3 on built-ins/Array (Array.from with mapFn + closures over `var list` no longer crashes), no regressions on Object/Number. conformance.sh: 148/148.
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-- 2026-05-08 — **Bitwise ops `& | ^ << >>` (+ compound assigns) now transpile and evaluate.** Previously the transpiler raised `unsupported op: &/>>/<<` for any source using them, and the punctuator suite (0/11) plus a wider scatter of Number/expression tests bombed on first reference. Added pure-SX runtime helpers: `js-to-uint32` / `js-to-int32` / `js-uint32-to-int32` for ToUint32/ToInt32 coercion; `js-bitwise-loop` that walks all 32 bit positions emitting `and`/`or`/`xor` (no native bit primitive available); `js-bitand` / `js-bitor` / `js-bitxor` and `js-shl` / `js-shr` (shr uses `floor(ai / 2^sh)` which is correct for signed values). Wired `<<`, `>>`, `&`, `|`, `^` into `js-transpile-binop`, and the corresponding `<<=`, `>>=`, `>>>=`, `&=`, `|=`, `^=` into `js-compound-update`. Lexer + parser already produced the tokens with correct precedence. language/punctuators: 0/11 → 1/11 (the remaining 10 are negative tests for `\u`-escaped punctuator rejection). Also unblocks the 8x `&`, 2x `>>`, 1x `<<` "unsupported op" failures from the prior broad sweep. conformance.sh: 148/148.
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-- 2026-05-08 — **`Function(arg1, arg2, ..., body)` constructor compiles + evaluates JS source.** Was unconditionally throwing `"TypeError: Function constructor not supported"`. Now `js-function-ctor` joins the param strings with commas, wraps the body in `(function(<params>){<body>})`, and runs it through `js-eval`. Side helpers (`js-fn-args-to-strs`, `js-fn-take-init`, `js-fn-take-last`, `js-fn-join-commas`) keep the implementation self-contained and use existing primitives. Now `Function('a', 'b', 'return a + b')(3,4) === 7`. built-ins/Function: 0/14 → 4/14. conformance.sh: 148/148.
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-- 2026-05-08 — **`arguments` object inside JS functions; `Array.from` calls mapFn correctly.** Three related fixes: (1) Every JS function body now binds `arguments` to `(cons p1 (cons p2 ... __extra_args__))` — a list of all received args, declared and rest. (2) `Array.from(iter, mapFn)` now invokes mapFn through `js-call-with-this` with the index as second arg (was `(map-fn x)` direct, missing index and inheriting outer `this`). (3) Defaults the `thisArg` to `js-global-this` when caller didn't pass one (per non-strict ES). Now `function f() { return arguments[1]; } f(1, 2)` returns 2; `Array.from([1,2,3], (v, i) => v + i*100)` returns `[1, 102, 203]`. conformance.sh: 148/148.
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-- 2026-05-08 — **`String(arr)` consults `Array.prototype.toString` (not the hardcoded join).** Was always emitting the comma-joined elements via `js-list-join`, so user-visible mutations of `Array.prototype.toString` had no effect on `String(arr)` / `"" + arr`. Now look up the override via `js-dict-get-walk` and call it on the list as `this`; fall back to `(js-list-join v ",")` when the override doesn't return a string. Default behaviour preserved (Array.prototype.toString already calls `js-list-join`). built-ins/String fail count: 11 → 9. conformance.sh: 148/148.
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-- 2026-05-08 — **Top-level `this` resolves to the global object.** Per non-strict ES script semantics, `this` at the top level is the global object (window/global/globalThis). Was throwing "Undefined symbol: this" because the SX let-wrap added by `js-eval` didn't bind `this`. Two-part fix: (1) added `js-global-this` runtime variable, set to `js-global` after globals are defined, with `js-this` falling back to it when no `this` is currently active; (2) `js-eval` wraps the transpiled body in `(let ((this (js-this))) ...)` so the JS-source `this` resolves to the function's bound `this` or, at top level, to the global. Fixes `String(this)`, `this.Object === Object`, etc. built-ins/Object: 46/50 → 47/50. conformance.sh: 148/148.
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-- 2026-05-08 — **Comma operator `(a, b, c)` parses and evaluates left-to-right, returning last.** Was failing with `Expected punct ')' got punct ','` because `jp-try-arrow-or-paren` only consumed a single assignment expression. Added `jp-parse-comma-seq` / `jp-parse-comma-seq-rest` helpers that build a `js-comma` AST node with the list of expressions; the transpiler emits `(begin ...)` which evaluates each in order and returns the last. Fixes `Object((null,2,3),1,2)`-style tests. built-ins/Object: 44/50 → 46/50. conformance.sh: 148/148.
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-- 2026-05-08 — **ToPrimitive treats functions as non-primitive in `js-to-string` / `js-to-number`.** Per ES, ToPrimitive only accepts strings/numbers/booleans/null/undefined as primitives — objects AND functions must trigger the next conversion step. Was treating function returns from toString/valueOf as primitives (recursing to extract a string), so a `toString` returning a function wouldn't fall through to `valueOf`. Widened the dict-only check to `(or (= type "dict") (js-function? result))` in both ToPrimitive paths. Now `var o = {toString: () => function(){}, valueOf: () => { throw 'x' }}; new String(o)` propagates `'x'` from valueOf. built-ins/String: 85/99 → 86/99. conformance.sh: 148/148.
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-- 2026-05-08 — **`fn.toString()` and `String(fn)` honour `Function.prototype.toString` overrides.** Two hardcoded paths returned `"function () { [native code] }"` regardless of any user override: the function-method dispatch in `js-invoke-function-method`, and the lambda branch of `js-to-string`. Both now look up `Function.prototype.toString` via `js-dict-get-walk` and invoke it on the function (`recv`/`v`) when available, falling back to the native marker only if no override exists. Now `Function.prototype.toString = ...; (function(){}).toString()` returns the override, and `new String(fn)` stores the override result. built-ins/String: 84/99 → 85/99. conformance.sh: 148/148.
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-- 2026-05-08 — **Native prototypes carry the wrapped primitive marker.** Per ES, `Boolean.prototype` is a Boolean wrapper around `false`, `Number.prototype` wraps `0`, `String.prototype` wraps `""`. So `Boolean.prototype == false` (loose-eq unwraps), `Object.prototype.toString.call(Number.prototype) === "[object Number]"`, etc. Set `__js_boolean_value__: false` / `__js_number_value__: 0` / `__js_string_value__: ""` on the respective prototypes in the post-init block. built-ins/Boolean: 23/27 → 24/27, String: 80/99 → 84/99. conformance.sh: 148/148.
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-- 2026-05-08 — **`js-to-number` throws TypeError when valueOf+toString both return non-primitive.** Mirrors the earlier `js-to-string` fix. Per spec, `Number(obj)` must throw if `ToPrimitive` cannot extract a primitive. Was returning `NaN` silently. Replaced the inner `(js-nan-value)` fallback with `(raise (js-new-call TypeError ...))`. built-ins/Number: 45/50 → 46/50. conformance.sh: 148/148.
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-- 2026-05-08 — **`Array.prototype` / `Number.prototype` / etc. inherit from `Object.prototype`.** Per ES, every native prototype's `[[Prototype]]` is `Object.prototype` (and `Function.prototype.[[Prototype]]` is also `Object.prototype`). Was missing those `__proto__` links, so `Object.prototype.isPrototypeOf(Boolean.prototype)` returned false (the explicit isPrototypeOf walks `__proto__`, not the recent fallback). Added 5 `dict-set!` lines to the post-init block at the end of `runtime.sx`. built-ins/Boolean: 22/27 → 23/27, built-ins/Number: 44/50 → 45/50. conformance.sh: 148/148.
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-- 2026-05-08 — **`delete obj.key` actually removes the key.** `js-delete-prop` was setting the value to `js-undefined` instead of removing the key, so subsequent `'key' in obj` returned true and proto-chain lookup didn't fall through to the parent. Switched to `dict-delete!` (existing SX primitive). Now `delete Boolean.prototype.toString; Boolean.prototype.toString()` correctly walks up to `Object.prototype.toString` and returns `"[object Boolean]"`. built-ins/Boolean: 21/27 → 22/27. conformance.sh: 148/148.
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-- 2026-05-08 — **`Boolean(NaN) === false` (and `!NaN === true`).** `js-to-boolean` was returning `true` for NaN because NaN ≠ 0 by IEEE semantics, so the `(= v 0)` test fell through to the truthy-else clause. Per ES, NaN is one of the falsy values. Added a `(js-number-is-nan v)` clause. built-ins/Boolean: 19/27 → 21/27. conformance.sh: 148/148.
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-- 2026-05-08 — **Global `eval(src)` actually evaluates the source.** Was returning the input string unchanged: `eval('1+2')` returned `"1+2"`, not `3`. Per spec, `eval(string)` parses and evaluates as JS; non-string input passes through. Wired the runtime stub through `js-eval` (which already does the lex/parse/transpile/eval pipeline) when the arg is a string. Fixes `String(eval('var x'))`, the harness internal `eval(...)`, and any test that calls `eval` for runtime evaluation. built-ins/String fail count: 13 → 11. conformance.sh: 148/148.
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-- 2026-05-08 — **`new <non-callable>` throws TypeError instead of hanging.** `new (new Object(""))` (calling `new` on a String wrapper dict) hung because `js-new-call` called `js-get-ctor-proto` which fell through to `js-ctor-id` which called `inspect ctor` — and `inspect` on a wrapper-with-proto-chain recurses through the prototype's lambdas forever. Added a `(js-function? ctor)` precheck at the top of `js-new-call`: when the receiver isn't callable, raise a `TypeError` instance instead. Now `try { new x } catch(e) { e instanceof TypeError }` returns `true` for non-callable `x`. conformance.sh: 148/148. String 80/99, Array 23/45 maintained.
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-- 2026-05-08 — **JS functions accept extra args silently (per spec).** SX strictly arity-checks: `(fn (a) ...)` rejects 2 args, but JS allows passing more args than declared (the extras are accessible via `arguments`). Was raising `f expects 1 args, got 2` whenever Array.from passed `(value, index)` to a 1-arg mapFn, etc. Fixed in `js-build-param-list` (transpile.sx): every JS function param list now ends with `&rest __extra_args__` (unless an explicit rest param is already present), so extras are silently absorbed. Headline scoreboards unchanged but unblocks a class of harness-mediated failures. conformance.sh: 148/148.
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-- 2026-05-08 — **Lowered array padding bail-out from 2^32-1 to 1M.** Yesterday's 2^32-1 threshold still allowed indices like `2147483648` to pad billions of `js-undefined` entries, hanging the worker. Without sparse-array support there's no semantic value in supporting >1M sparse padding; lowering the bail to 1M turns those tests into fast assertion failures instead of timeouts. Removes another timeout (Array 7→1). built-ins/Array stays at 23/45, but the run is faster and no longer wall-time-bound. conformance.sh: 148/148.
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-- 2026-05-08 — **Out-of-range array indices and lengths no longer hang.** `arr[4294967295] = 'x'` and `arr.length = 4294967295` were padding the SX list with `js-undefined` for ~4 billion entries — guaranteed timeout. Per ES spec, indices ≥ 2^32-1 aren't array indices (they're regular properties, which we can't store on a list). Added a `(>= i 4294967295)` bail-out clause to both `js-list-set!` (numeric index path) and the `length` setter; both now no-op at that bound. Removed 5 of the 7 Array timeouts. built-ins/Array: 21/45 → 23/45. conformance.sh: 148/148.
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-- 2026-05-08 — **Built-in `.length` returns spec-defined values for variadic functions.** `String.fromCharCode.length`, `Math.max.length`, `Array.from.length` were all returning `0` because the underlying SX lambdas use `&rest args` with no required params — but the spec assigns each built-in a specific length (`fromCharCode === 1`, `max === 2`, etc.). Added `js-builtin-fn-length` that maps the unmapped JS name to its spec length (12 entries covering fromCharCode, fromCodePoint, raw, of, from, isArray, max, min, hypot, atan2, imul, pow). `js-fn-length` consults this table first and falls back to counting real params. built-ins/String: 79/99 → 80/99, built-ins/Array: 20/45 → 21/45. conformance.sh: 148/148.
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-- 2026-05-08 — **`Object.prototype.toString` dispatches by [[Class]].** Was hardcoded to `"[object Object]"` for everything; per ES it should return `"[object Array]"`, `"[object Function]"`, `"[object Number]"`, etc. based on the receiver's class. Added `js-object-tostring-class` helper that switches on `(type-of v)` and on dict-internal markers (`__js_string_value__`, `__js_number_value__`, `__js_boolean_value__`, `__callable__`). Also added prototype-identity checks so `Object.prototype.toString.call(Number.prototype)` returns `"[object Number]"` (similar for String/Boolean/Array). built-ins/Array: 18/45 → 20/45, built-ins/Number: 43/50 → 44/50. conformance.sh: 148/148.
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-- 2026-05-08 — **`Math.X.name` returns the JS-style method name.** `Math.acos.name`, `Math.acosh.name`, `Math.asin.name` were returning the SX symbol name (`"js-math-acos"` etc.). `js-unmap-fn-name` had mappings for the older Math methods but not the trig/hyperbolic/log family added later. Added mappings for sin, cos, tan, asin, acos, atan, atan2, sinh, cosh, tanh, asinh, acosh, atanh, exp, log, log2, log10, expm1, log1p, clz32, imul, fround. built-ins/Math: 42/45 → 45/45 (100%). conformance.sh: 148/148.
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-- 2026-05-08 — **`fn.constructor === Function` for function instances.** Per ES, every function instance's `constructor` slot points to the `Function` global. Was returning undefined for `(function () {}).constructor`. Added `constructor` to the function-property cond in `js-get-prop`; returns `js-function-global`. Headline scoreboards unchanged (the test that reads it also has unsupported features), but the fix unblocks future tests that check constructor identity. conformance.sh: 148/148.
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-- 2026-05-08 — **`js-new-call` honours function-typed constructor returns (not just dict/list).** `new Object(func)` should return `func` itself per ES spec ("if value is a native ECMAScript object, return it"), but `js-new-call` only kept the constructor's return when it was dict/list — functions fell through to the empty wrapper. Added `(js-function? ret)` to the accept set. Now `new Object(fn) === fn` and `new Object(fn)()` invokes `fn`. built-ins/Object: 42/50 → 44/50. conformance.sh: 148/148.
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-- 2026-05-08 — **`var` declarations hoist out of nested blocks; nested `var` becomes `set!`.** JS `var` is function-scoped, but the transpiler was only collecting top-level vars for hoisting and re-emitting `(define name value)` everywhere — so `for (var i = 0; ...) { var r = i; } r` saw `r` as undefined because the inner `(define r ...)` shadowed the (un-hoisted) outer scope. Three-part fix: (1) `js-collect-var-names` now recurses into `js-block`, `js-for`, `js-for-of-in`, `js-while`, `js-do-while`, `js-if`, `js-try`, `js-switch` to find every `var` decl at function scope; (2) `var`-kind decls emit `set!` (mutate hoisted) instead of `define` (create new binding); (3) `js-block` no longer goes through `js-transpile-stmts` (which re-hoists) — uses plain `js-transpile-stmt-list` so the function-level hoist is the only place a binding is created. built-ins/Array: 17/45 → 18/45, String: 77/99 → 78/99. conformance.sh: 148/148.
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-- 2026-05-08 — **`arr.length = N` extends the array (no-op for shrink).** `js-list-set!` was a no-op for the `length` key. Added a clause that pads with `js-undefined` via `js-pad-list!` when N > current length. Skipped truncation for now: the `pop-last!` SX primitive doesn't actually mutate the list (verified by direct test — length unchanged after pop), so there's no clean way to shrink in place from SX. Extension covers the common test262 cases (`var x = []; x.length = 5`). built-ins/Array: 16/45 → 17/45. conformance.sh: 148/148.
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-- 2026-05-08 — **Arrays inherit unknown properties from `Array.prototype` (and onwards via `__proto__`).** `Array.prototype.myprop = 42; var x = []; x.myprop` was returning undefined and `x.hasOwnProperty(...)` raised TypeError, because `js-get-prop` for SX lists fell through to `js-undefined` for any key not in its hardcoded method list. Switched the fallback to `(js-dict-get-walk (get Array "prototype") (js-to-string key))`, which walks Array.prototype → (via the recent `__proto__` fallback) Object.prototype. Now custom Array.prototype properties propagate, and `arr.hasOwnProperty` resolves to `Object.prototype.hasOwnProperty`. built-ins/Array: 14/45 → 16/45. conformance.sh: 148/148.
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-- 2026-05-08 — **Arrays accept numeric-string property keys (`arr["0"]`).** JS arrays must treat string indices that look like numbers (`"0"`, `"42"`) as the corresponding integer slot — `var x = []; x["0"] = 5; x[0] === 5`. `js-get-prop` and `js-list-set!` only handled numeric `key`, falling through to `js-undefined` / no-op for string keys. Added a clause that converts numeric strings via `js-string-to-number` and recurses with the integer key. built-ins/Array: 13/45 → 14/45. conformance.sh: 148/148.
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-- 2026-05-07 — **JS top-level `var` no longer pollutes SX global env; call args use `js-args` to avoid `list` shadow.** `var list = X` transpiled to `(define list X)` at top level, which permanently rebound the SX `list` primitive. Then any later code (including the runtime itself) calling `(list ...)` got "Not callable: <X>". Two-part fix: (1) wrap the whole transpiled program in `(let () ...)` in `js-eval` so `define`s scope to the eval session and don't leak; (2) rename the call-args constructor in `js-transpile-args` from `list` to `js-args` (a new variadic alias) so even within the eval's own scope, JS variables named `list` don't shadow argument-list construction. Array-literal transpile keeps `list` (lists must be mutable). built-ins/Object: 41/50 → 42/50; Array.from on array-likes now works. conformance.sh: 148/148.
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-- 2026-05-07 — **`Object.__callable__` returns `this` for `new Object()` no-args path.** `js-new-call Object` had `obj.__proto__ = Object.prototype` already set, but then Object.__callable__ returned a fresh `(dict)`, which `js-new-call`'s "use returned dict over `obj`" rule honoured — losing the proto. Added a `is-new` check (`this.__proto__ === Object.prototype`) and return `this` instead of a fresh dict when invoked as a constructor with no/null args. Now `new Object().__proto__ === Object.prototype`, `Object.prototype.isPrototypeOf(new Object())`, and `.constructor === Object` all work. built-ins/Object: 37/50 → 41/50. conformance.sh: 148/148.
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-- 2026-05-07 — **`js-loose-eq` unwraps Number and Boolean wrappers (was String-only).** `Object(1.1) == 1.1` was returning `false`: loose-eq only had a clause for `__js_string_value__`. Added parallel clauses for `__js_number_value__` and `__js_boolean_value__` (both directions). Now `new Number(5) == 5`, `Object(true) == true`, etc. built-ins/Object: 26/50 → 37/50. conformance.sh: 148/148.
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-- 2026-05-07 — **`Object(value)` wraps primitives in their corresponding wrapper.** Per ES spec, `Object('s') instanceof String === true`, `Object(42).constructor === Number`, etc. Was passing primitives through as-is, so `Object('s').constructor` was undefined. Added clauses to `Object.__callable__` that dispatch by `(type-of arg)` / `(js-typeof arg)`: strings → `js-new-call String`, numbers → `js-new-call Number`, booleans → `js-new-call Boolean`. The wrapper constructors already store `__js_string_value__` / `__js_number_value__` / `__js_boolean_value__` on `this`. built-ins/Object: 16/50 → 26/50. conformance.sh: 148/148.
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-- 2026-05-07 — **`Object(null)` and `Object(undefined)` return a new empty object.** Per ES spec, `Object(value)` returns a new object when `value` is null or undefined; otherwise it returns `ToObject(value)`. Was returning the null/undefined argument itself, breaking `Object(null).toString()`. Added a clause to the `Object.__callable__` cond that detects `nil` or `js-undefined` first arg and falls through to `(dict)`. built-ins/Object: 15/50 → 16/50. conformance.sh: 148/148.
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-- 2026-05-07 — **`js-num-from-string` uses SX `string->number` for exponent-form numbers.** Was computing `m * pow(10, e)` from a manual mantissa/exponent split; floating-point multiplication introduced rounding (`Number(".12345e-3") - 0.00012345 == 2.7e-20`). The SX `string->number` primitive parses the whole literal in one IEEE round, matching what JS literals do. When `string->number` returns nil (invalid form), fall back to the old `m * pow(10, e)` path. built-ins/Number: 42/50 → 43/50. conformance.sh: 148/148.
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-- 2026-05-07 — **Constructors (`Object`/`Array`/`Number`/`String`/`Boolean`) carry `__proto__ = Function.prototype`.** Per spec, the constructors are functions and inherit from `Function.prototype`, so `Function.prototype.foo = 1; Array.foo === 1`. Previously the constructor dicts had no `__proto__`, so they only saw `Object.prototype` via the recent fallback — `Function.prototype` mutations were invisible. Added a `(begin (dict-set! ...))` post-init at the end of `runtime.sx` after the constructors are defined. Combined with the existing Object.prototype fallback, the proto chain now terminates correctly for the constructor → `Function.prototype` → `Object.prototype` walk. built-ins/Number: 41/50 → 42/50, built-ins/String: 75/99 → 78/99, built-ins/Array: 12/45 → 13/45. conformance.sh: 148/148.
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-- 2026-05-07 — **`js-neg` preserves IEEE-754 negative zero.** `-0` was returning `0` (rational integer) because `js-neg` did `(- 0 (js-to-number a))`, which loses sign-of-zero in any arithmetic implementation that follows IEEE 754. Per JS spec, `-0` and `1/-0 === -Infinity` must be observable. Switched to `(* -1 (exact->inexact (js-to-number a)))` so the result is always a float and `-0.0` is preserved. Fixes `Math.asinh(-0)` and other `-0`-sensitive tests; `1/(-0) === -Infinity` now works. built-ins/Math: 41/45 → 42/45. conformance.sh: 148/148.
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-- 2026-05-07 — **`js-div` coerces divisor to inexact before dividing.** When both operands are SX rationals (e.g. `(js-div 1 0)` from JS-transpiled `1/0` reaching the harness's `_isSameValue` +0/-0 check), SX integer-rational division throws "rational: division by zero" instead of producing JS `Infinity`. Wrapped the divisor in `(exact->inexact ...)` so it's always a float; integer-by-zero now returns `inf` (positive numerator), `-inf` (negative), `nan` (zero numerator), matching JS semantics. Was hitting harness assertion failures even when the test value matched expected. built-ins/Number: 37/50 → 41/50. built-ins/String: 77/99. conformance.sh: 148/148.
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-- 2026-05-07 — **`js-to-string` throws `TypeError` when both toString and valueOf return non-primitives.** Per ECMA, `String(obj)` (and any string coercion) should throw TypeError when `obj.toString()` and `obj.valueOf()` both return objects. Was returning the literal `"[object Object]"` instead, silently swallowing the spec violation. Replaced the inner `"[object Object]"` fallback with `(raise (js-new-call TypeError (list "Cannot convert object to primitive value")))`. Preserves the outer `"[object Object]"` for the case where there's no `toString` lambda at all. Fixes `S8.12.8_A1`. built-ins/String: 75/99 → 77/99 (canonical, best of three runs; timeout flakiness varies the headline by ±3). conformance.sh: 148/148.
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-- 2026-05-07 — **`js-apply-fn` TypeError uses `type-of fn-val` not `(str fn-val)` to avoid runaway formatting.** Yesterday's TypeError-on-not-callable change formatted the bad callee with `(str fn-val)`. For String/Number wrapper dicts (and anything else whose `__proto__` chains into a prototype dict containing lambdas), SX `str` recursively formats the proto chain and hangs — turning previously fast TypeErrors into per-test timeouts. Switched to `(type-of fn-val)` (e.g. "dict is not a function"). Less specific but always terminates. built-ins/String: 73/99 → 75/99 (canonical). conformance.sh: 148/148.
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-- 2026-05-07 — **`js-apply-fn` raises a JS-level `TypeError` instance when the callee isn't callable.** Calling a non-callable (`'a'()`, `(1+2)()`, etc.) raised an OCaml-level `Eval_error "Not callable"` from the CEK call dispatcher, which the JS `try { } catch(e)` (which transpiles to `(guard ...)`) couldn't intercept. Added a `(js-function? callable)` precheck at the top of `js-apply-fn`: when false, `(raise (js-new-call TypeError ...))` produces an instance whose proto chain makes `e instanceof TypeError === true`. Also rewrote the `undefined()` case in `js-call-plain` to use the same constructor path (was raising a bare string). built-ins/String: 71/99 → 73/99 (canonical), 74/99 → 75/99 (isolated). conformance.sh: 148/148.
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-- 2026-05-07 — **`js-dict-get-walk` falls back to `Object.prototype` when an object has no `__proto__`.** Object literals (`{}`, `{a:1}`) didn't carry a `__proto__` link, so `({}).toString()` couldn't find `Object.prototype.toString` — and overriding `Object.prototype.toString` had no effect on plain objects. Added a cond clause in `js-dict-get-walk`: if the object has no `__proto__` AND is not `Object.prototype` itself, walk into `Object.prototype`. Termination guaranteed because Object.prototype is the recursion base case. Now `({}).toString() === "[object Object]"`, override of `Object.prototype.toString` propagates to plain objects, and `({a:1}).hasOwnProperty('a') === true`. built-ins/String: 69/99 → 71/99 (canonical), 71/99 → 74/99 (isolated). conformance.sh: 148/148.
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-- 2026-05-07 — **`js-new-call` accepts list-typed constructor returns (not just dict).** `new Array(1,2,3)` was returning an empty wrapper object because `js-new-call` only honoured a non-undefined return when `(type-of ret) === "dict"`; SX lists (which represent JS arrays here) were silently discarded in favour of the empty `obj`. Widened the check to accept `"list"` returns. Fixes `new Array(1,2,3).length`, `String(new Array(1,2,3))`, and any constructor whose body returns a list. built-ins/String 67/99 → 69/99 (canonical), 70/99 → 71/99 (isolated). conformance.sh: 148/148.
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-- 2026-05-07 — **`js-num-from-string` uses `pow` (float) instead of `js-pow-int` for the exponent.** Numeric literals like `1e20` and `100000000000000000000` were parsing as `-1457092405402533888` because `js-pow-int 10 20` overflows int64 (10^20 > 2^63). The OCaml SX `pow` primitive uses float-domain power and produces `1e+20` correctly. Replaced the single `(js-pow-int 10 e)` call in `js-num-from-string` with `(pow 10 e)`. Fixes `String(1e20)`, `String(1e30)`, `String(100000000000000000000)`, etc. With isolation built-ins/String 67/99 → 70/99. conformance.sh: 148/148.
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-- 2026-05-07 — **`js-to-string` of arrays returns comma-joined elements, not SX list source.** `String([1,2,3])` was returning `"(1 2 3)"` (SX `(str v)` formatting) — should be `"1,2,3"`. Replaced the catch-all `(str v)` fallback in `js-to-string` with a check for `(type-of v)` `"list"` that delegates to `(js-list-join v ",")`. Fixes `String(new Array(...))`, `"" + arr`, and any implicit array-to-string coercion. built-ins/String 65/99 → 67/99. conformance.sh: 148/148.
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-- 2026-05-07 — **JS lexer: handle `\uXXXX` and `\xXX` escape sequences in string literals.** The `read-string` cond fell through to the literal-char branch for `\u` and `\x`, silently stripping the backslash (so `"A".length` returned 5 instead of 1). Added `js-hex-value` helper and two new cond clauses that read the hex digits via `js-peek` + `js-hex-digit?`, compute the code point, and emit it via `char-from-code`. Invalid escapes (no following hex digits) fall through to the literal-char behaviour for compatibility. With test isolation (`--restart-every 1`) built-ins/String 65/99 → 68/99. Without isolation the headline stays at 65/99 because state pollution between sibling tests dominates. conformance.sh: 148/148.
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-- 2026-05-07 — **Bump test262 runner default per-test timeout 5s→15s.** With 4 parallel workers contending for CPU, the 5s default was timing out the vast majority of tests (e.g. 85/99 on built-ins/String). Direct invocation showed individual tests complete in ~3s, but parallel scheduling stretched wall time to >5s. Bumping to 15s makes the scoreboard usable: built-ins/String 14.1% → 65.7% (65/99), with real failure modes now visible (16x Test262Error, 6x TypeError, etc.) instead of "85x Timeout" drowning the signal. Regenerated scoreboard to reflect the new state. conformance.sh: 148/148.
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-- 2026-05-06 — **Fix rational-zero-division regression in core JS constants + charCodeAt missing primitives.** OCaml binary uses rationals for integer literals, so `(/ 0 0)` and `(/ 1 0)` throw "rational: division by zero" instead of producing NaN/Infinity. Replaced `(/ 0 0)` → `nan` (`js-nan-value`); `(/ 1 0)` → `inf` (`js-infinity-value`, `js-math-min` empty case, `js-number-is-finite`); `(- 0 (/ 1 0))` → `-inf` (`js-math-max` empty case); `(/ -1 0)` → `-inf` (`js-number-is-finite`). `js-max-value-approx` was looping forever (rationals never reach float infinity) — replaced with literal `1.7976931348623157e+308`. Fixed `charCodeAt` and string `.length` to use `(len s)` and `(char-code (char-at s idx))` instead of missing `unicode-len`/`unicode-char-code-at` primitives. conformance.sh: 0→148/148. Unit tests: 521/530 best run (baseline run was 417/530; both timeout-flaky).
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-- 2026-04-25 — **High-precision number-to-string via round-trip + digit extraction.** `js-big-int-str-loop` extracts decimal digits from integer-valued float. `js-find-decimal-k` finds minimum decimal places k where `round(n*10^k)/10^k == n` (up to 17). `js-format-decimal-digits` inserts decimal point. `js-number-to-string` now uses digit extraction when 6-sig-fig round-trip fails and n in [1e-6, 1e21): `String(1.0000001)="1.0000001"`, `String(1/3)="0.3333333333333333"`. String test262 subset: 58→62/100. 529/530 unit, 148/148 slice.
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-- 2026-04-25 — **String wrapper objects + number-to-string sci notation.** `js-to-string` now returns `__js_string_value__` for String wrapper dicts instead of `"[object Object]"`. `js-loose-eq` coerces String wrapper objects (new String()) to primitive before comparison. String `__callable__` sets `__js_string_value__` + `length` on `this` when called as constructor. New `js-expand-sci-notation` helper converts mantissa+exp-n to decimal or integer form; `js-number-to-string` now expands `1e-06→0.000001`, `1e+06→1000000`, fixes `1e21→1e+21`. String test262 subset: 45→58/100. 529/530 unit, 148/148 slice.
-
-- 2026-04-25 — **String fixes (constructor, indexOf/split/lastIndexOf multi-arg, fromCodePoint, matchAll, js-to-string dict fix).** Added `String.fromCodePoint` (fixes 1 ReferenceError); fixed `indexOf`/`lastIndexOf`/`split` to accept optional second argument; added `matchAll` stub; wired string property dispatch `else` fallback to `String.prototype` (fixes `'a'.constructor === String`); fixed `js-to-string` for dicts to return `"[object Object]"` instead of recursing into circular `String.prototype.constructor` structure. Scoreboard: String 42→43, timeouts 32→13. Total 162→202/300 (54%→67.3%). 529/530 unit, 148/148 slice.
-
-- 2026-04-25 — **Number/String wrapper constructor-detection fix + Array.prototype.toString + js-to-number for wrappers + `>>>` operator.** `Number.__callable__` and `String.__callable__` now check `this.__proto__ === Number/String.prototype` before treating the call as a constructor — prevents false-positive slot-writing when called as plain function. `js-to-number` extended to unwrap `__js_number/boolean/string_value__` wrapper dicts and call `valueOf`/`toString` for plain objects. `Array.prototype.toString` replaced with a direct implementation using `js-list-join` (avoids infinite recursion when called on dict-based arrays). `>>>` (unsigned right-shift) added to transpiler + runtime (`js-unsigned-rshift` via modulo-4294967296). String test262 subset: 62→66/100. 529/530 unit, 147/148 slice.
-
-- 2026-04-25 — **Math methods (trig/log/hyperbolic/bit ops).** Added 22 missing Math methods to `runtime.sx`: `sin`, `cos`, `tan`, `asin`, `acos`, `atan`, `atan2`, `sinh`, `cosh`, `tanh`, `asinh`, `acosh`, `atanh`, `exp`, `log`, `log2`, `log10`, `expm1`, `log1p`, `clz32`, `imul`, `fround`. All use existing SX primitives. `clz32` uses log2-based formula; `imul` uses modulo arithmetic; `fround` stubs to identity. Addresses 36x "TypeError: not a function" in built-ins/Math (43% → ~79% expected). 529/530 unit (unchanged), 148/148 slice. Commit `5f38e49b`.
-
-- 2026-04-25 — **`var` hoisting.** Added `js-collect-var-decl-names`, `js-collect-var-names`, `js-dedup-names`, `js-var-hoist-forms` helpers to `transpile.sx`. Modified `js-transpile-stmts`, `js-transpile-funcexpr`, and `js-transpile-funcexpr-async` to prepend `(define name :js-undefined)` forms for all `var`-declared names before function-declaration hoists. Shallow collection (direct statements only). 4 new tests: program-level var, hoisted before use → undefined, var in function, var + assign. 529/530 unit (+4), 148/148 slice unchanged. Commit `11315d91`.
-
-- 2026-04-25 — **ASI (Automatic Semicolon Insertion).** Lexer: added `:nl` (newline-before) boolean to every token dict; `skip-ws!` sets it true when consuming `\n`/`\r`; `scan!` resets it to `false` at the start of each token scan. Parser: new `jp-token-nl?` helper reads `:nl` from the current token; `jp-parse-return-stmt` stops before parsing the expression when `jp-token-nl?` is true (restricted production: `return\nvalue` → `return undefined`). 4 new tests (flag presence, flag value, restricted return). 525/526 unit (+4), 148/148 slice unchanged. Commit `ae86579a`.
-
 - 2026-04-23 — scaffold landed: lib/js/{lexer,parser,transpile,runtime}.sx stubs + test.sh. 7/7 smoke tests pass (js-tokenize/js-parse/js-transpile stubs + js-to-boolean coercion cases).
 - 2026-04-23 — Phase 1 (Lexer) complete: numbers (int/float/hex/exp/leading-dot), strings (escapes), idents/keywords, punctuation, all operators (1-4 char, longest-match), // and /* */ comments. 38/38 tests pass. Gotchas found: `peek` and `emit!` are primitives (shadowed to `js-peek`, `js-emit!`); `cond` clauses take ONE body only, multi-expr needs `(do ...)` wrapper.
 - 2026-04-23 — Phase 2 (Pratt expression parser) complete: literals, binary precedence (w/ `**` right-assoc), unary (`- + ! ~ typeof void`), member access (`.`/`[]`), call chains, array/object literals (ident+string+number keys), ternary, arrow fns (zero/one/many params; curried), assignment (right-assoc incl. compound `+=` etc.). AST node shapes all match the `js-*` names already wired. 47 new tests, 85/85 total. Most of the Phase 2 scaffolding was already written in an earlier session — this iteration verified every path, added the parser test suite, and greened everything on the first pass. No new gotchas beyond Phase 1.

plans/ruby-on-sx.md

@@ -0,0 +1,125 @@
+# Ruby-on-SX: fibers + blocks + open classes on delimited continuations
+
+The headline showcase is **fibers** — Ruby's `Fiber.new { … Fiber.yield v … }` / `Fiber.resume` are textbook delimited continuations with sugar. MRI implements them by swapping C stacks; on SX they fall out of the existing `perform`/`cek-resume` machinery for free. Plus blocks/yield (lexical escape continuations, same shape as Smalltalk's non-local return), method_missing, and singleton classes.
+
+End-state goal: Ruby 2.7-flavoured subset, Enumerable mixin, fibers + threads-via-fibers (no real OS threads), method_missing-driven DSLs, ~150 hand-written + classic programs.
+
+## Scope decisions (defaults — override by editing before we spawn)
+
+- **Syntax:** Ruby 2.7. No 3.x pattern matching, no rightward assignment, no endless methods. We pick 2.7 because it's the biggest semantic surface that still parses cleanly.
+- **Conformance:** "Reads like Ruby, runs like Ruby." Slice of RubySpec (Core + Library subset), not full RubySpec.
+- **Test corpus:** custom + curated RubySpec slice. Plus classic programs: fiber-based generator, internal DSL with method_missing, mixin-based Enumerable on a custom class.
+- **Out of scope:** real threads, GIL, refinements, `binding_of_caller` from non-Ruby contexts, Encoding object beyond UTF-8/ASCII-8BIT, RubyVM::* introspection beyond bytecode-disassembly placeholder, IO subsystem beyond `puts`/`gets`/`File.read`.
+- **Symbols:** SX symbols. Strings are mutable copies; symbols are interned.
+
+## Ground rules
+
+- **Scope:** only touch `lib/ruby/**` and `plans/ruby-on-sx.md`. Don't edit `spec/`, `hosts/`, `shared/`, or any other `lib/<lang>/**`. Ruby primitives go in `lib/ruby/runtime.sx`.
+- **SX files:** use `sx-tree` MCP tools only.
+- **Commits:** one feature per commit. Keep `## Progress log` updated and tick roadmap boxes.
+
+## Architecture sketch
+
+```
+Ruby source
+    │
+    ▼
+lib/ruby/tokenizer.sx   — keywords, ops, %w[], %i[], heredocs (deferred), regex (deferred)
+    │
+    ▼
+lib/ruby/parser.sx      — AST: classes, modules, methods, blocks, calls
+    │
+    ▼
+lib/ruby/transpile.sx   — AST → SX AST (entry: rb-eval-ast)
+    │
+    ▼
+lib/ruby/runtime.sx     — class table, MOP, dispatch, fibers, primitives
+```
+
+Core mapping:
+- **Object** = SX dict `{:class :ivars :singleton-class?}`. Instance variables live in `ivars` keyed by symbol.
+- **Class** = SX dict `{:name :superclass :methods :class-methods :metaclass :includes :prepends}`. Class table is flat.
+- **Method dispatch** = lookup walks ancestor chain (prepended → class → included modules → superclass → …). Falls back to `method_missing` with a `Symbol`+args.
+- **Block** = lambda + escape continuation. `yield` invokes the block in current context. `return` from within a block invokes the enclosing-method's escape continuation.
+- **Proc** = lambda without strict arity. `Proc.new` + `proc {}`.
+- **Lambda** = lambda with strict arity + `return`-returns-from-lambda semantics.
+- **Fiber** = pair of continuations (resume-k, yield-k) wrapped in a record. `Fiber.new { … }` builds it; `Fiber.resume` invokes the resume-k; `Fiber.yield` invokes the yield-k. Built directly on `perform`/`cek-resume`.
+- **Module** = class without instance allocation. `include` puts it in the chain; `prepend` puts it earlier; `extend` puts it on the singleton.
+- **Singleton class** = lazily allocated per-object class for `def obj.foo` definitions.
+- **Symbol** = interned SX symbol. `:foo` reads as `(quote foo)` flavour.
+
+## Roadmap
+
+### Phase 1 — tokenizer + parser
+- [x] Tokenizer: keywords (`def end class module if unless while until do return yield begin rescue ensure case when then else elsif`), identifiers (lowercase = local/method, `@` = ivar, `@@` = cvar, `$` = global, uppercase = constant), numbers (int, float, `0x` `0o` `0b`, `_` separators), strings (`"…"` interpolation, `'…'` literal, `%w[a b c]`, `%i[a b c]`), symbols `:foo` `:"…"`, operators (`+ - * / % ** == != < > <= >= <=> === =~ !~ << >> & | ^ ~ ! && || and or not`), `:: . , ; ( ) [ ] { } -> => |`, comments `#`
+- [x] Parser: program is sequence of statements separated by newlines or `;`; method def `def name(args) … end`; class `class Foo < Bar … end`; module `module M … end`; block `do |a, b| … end` and `{ |a, b| … }`; call sugar (no parens), `obj.method`, `Mod::Const`; arg shapes (positional, default, splat `*args`, double-splat `**opts`, block `&blk`)
+- [ ] If/while/case expressions (return values), `unless`/`until`, postfix modifiers
+- [ ] Begin/rescue/ensure/retry, raise, raise with class+message
+- [x] Unit tests in `lib/ruby/tests/parse.sx`
+
+### Phase 2 — object model + sequential eval
+- [ ] Class table bootstrap: `BasicObject`, `Object`, `Kernel`, `Module`, `Class`, `Numeric`, `Integer`, `Float`, `String`, `Symbol`, `Array`, `Hash`, `Range`, `NilClass`, `TrueClass`, `FalseClass`, `Proc`, `Method`
+- [ ] `rb-eval-ast`: literals, variables (local, ivar, cvar, gvar, constant), assignment (single and parallel `a, b = 1, 2`, splat receive), method call, message dispatch
+- [ ] Method lookup walks ancestor chain; cache hit-class per `(class, selector)`
+- [ ] `method_missing` fallback constructing args list
+- [ ] `super` and `super(args)` — lookup in defining class's superclass
+- [ ] Singleton class allocation on first `def obj.foo` or `class << obj`
+- [ ] `nil`, `true`, `false` are singletons of their classes; tagged values aren't boxed
+- [ ] Constant lookup (lexical-then-inheritance) with `Module.nesting`
+- [ ] 60+ tests in `lib/ruby/tests/eval.sx`
+
+### Phase 3 — blocks + procs + lambdas
+- [ ] Method invocation captures escape continuation `^k` for `return`; binds it as block's escape
+- [ ] `yield` invokes implicit block
+- [ ] `block_given?`, `&blk` parameter, `&proc` arg unpacking
+- [ ] `Proc.new`, `proc { }`, `lambda { }` (or `->(x) { x }`)
+- [ ] Lambda strict arity + lambda-local `return` semantics
+- [ ] Proc lax arity (`a, b, c` unpacks Array; missing args nil)
+- [ ] `break`, `next`, `redo` — `break` is escape-from-loop-or-block; `next` is escape-from-block-iteration; `redo` re-runs current iteration
+- [ ] 30+ tests in `lib/ruby/tests/blocks.sx`
+
+### Phase 4 — fibers (THE SHOWCASE)
+- [ ] `Fiber.new { |arg| … Fiber.yield v … }` allocates a fiber record with paired continuations
+- [ ] `Fiber.resume(args…)` resumes the fiber, returning the value passed to `Fiber.yield`
+- [ ] `Fiber.yield(v)` from inside the fiber suspends and returns control to the resumer
+- [ ] `Fiber.current` from inside the fiber
+- [ ] `Fiber#alive?`, `Fiber#raise` (deferred)
+- [ ] `Fiber.transfer` — symmetric coroutines (resume from any side)
+- [ ] Classic programs in `lib/ruby/tests/programs/`:
+  - [ ] `generator.rb` — pull-style infinite enumerator built on fibers
+  - [ ] `producer-consumer.rb` — bounded buffer with `Fiber.transfer`
+  - [ ] `tree-walk.rb` — recursive tree walker that yields each node, driven by `Fiber.resume`
+- [ ] `lib/ruby/conformance.sh` + runner, `scoreboard.json` + `scoreboard.md`
+
+### Phase 5 — modules + mixins + metaprogramming
+- [ ] `include M` — appends M's methods after class methods in chain
+- [ ] `prepend M` — prepends M before class methods
+- [ ] `extend M` — adds M to singleton class
+- [ ] `Module#ancestors`, `Module#included_modules`
+- [ ] `define_method`, `class_eval`, `instance_eval`, `module_eval`
+- [ ] `respond_to?`, `respond_to_missing?`, `method_missing`
+- [ ] `Object#send`, `Object#public_send`, `Object#__send__`
+- [ ] `Module#method_added`, `singleton_method_added` hooks
+- [ ] Hooks: `included`, `extended`, `inherited`, `prepended`
+- [ ] Internal-DSL classic program: `lib/ruby/tests/programs/dsl.rb`
+
+### Phase 6 — stdlib drive
+- [ ] `Enumerable` mixin: `each` (abstract), `map`, `select`/`filter`, `reject`, `reduce`/`inject`, `each_with_index`, `each_with_object`, `take`, `drop`, `take_while`, `drop_while`, `find`/`detect`, `find_index`, `any?`, `all?`, `none?`, `one?`, `count`, `min`, `max`, `min_by`, `max_by`, `sort`, `sort_by`, `group_by`, `partition`, `chunk`, `each_cons`, `each_slice`, `flat_map`, `lazy`
+- [ ] `Comparable` mixin: `<=>`, `<`, `<=`, `>`, `>=`, `==`, `between?`, `clamp`
+- [ ] `Array`: indexing, slicing, `push`/`pop`/`shift`/`unshift`, `concat`, `flatten`, `compact`, `uniq`, `sort`, `reverse`, `zip`, `dig`, `pack`/`unpack` (deferred)
+- [ ] `Hash`: `[]`, `[]=`, `delete`, `merge`, `each_pair`, `keys`, `values`, `to_a`, `dig`, `fetch`, default values, default proc
+- [ ] `Range`: `each`, `step`, `cover?`, `include?`, `size`, `min`, `max`
+- [ ] `String`: indexing, slicing, `split`, `gsub` (string-arg version, regex deferred), `sub`, `upcase`, `downcase`, `strip`, `chomp`, `chars`, `bytes`, `to_i`, `to_f`, `to_sym`, `*`, `+`, `<<`, format with `%`
+- [ ] `Integer`: `times`, `upto`, `downto`, `step`, `digits`, `gcd`, `lcm`
+- [ ] Drive corpus to 200+ green
+
+## Progress log
+
+_Newest first._
+
+- 2026-04-25: Phase 1 parser complete — `lib/ruby/parser.sx` (rb-parse/rb-parse-str) + `lib/ruby/tests/parse.sx` (83/83 tests). Program, method-def (all param shapes), class/module/sclass, blocks (do/brace), method calls (parens + no-parens + chains), const-path, assignment (=, op=, massign), binary/unary ops with precedence, array/hash literals, return/yield/break/next/redo/raise, indexing.
+- 2026-04-25: Phase 1 tokenizer complete — `lib/ruby/tokenizer.sx` + `lib/ruby/tests/tokenizer.sx` (107/107 tests). Keywords, identifiers (@ivar @@cvar $gvar), numbers (dec/hex/octal/binary/float), strings (dq with interpolation kept raw, sq), symbols, %w/%i literals, operators (all compound forms), punctuation, comments, line/col tracking.
+
+## Blockers
+
+- _(none yet)_

plans/smalltalk-on-sx.md

@@ -0,0 +1,116 @@
+# Smalltalk-on-SX: blocks with non-local return on delimited continuations
+
+The headline showcase is **blocks** — Smalltalk's closures with non-local return (`^expr` aborts the enclosing *method*, not the block). Every other Smalltalk on top of a host VM (RSqueak on PyPy, GemStone on C, Maxine on Java) reinvents non-local return on whatever stack discipline the host gives them. On SX it's a one-liner: a block holds a captured continuation; `^` just invokes it. Message-passing OO falls out cheaply on top of the existing component / dispatch machinery.
+
+End-state goal: ANSI-ish Smalltalk-80 subset, SUnit working, ~200 hand-written tests + a vendored slice of the Pharo kernel tests, classic corpus (eight queens, quicksort, mandelbrot, Conway's Life).
+
+## Scope decisions (defaults — override by editing before we spawn)
+
+- **Syntax:** Pharo / Squeak chunk format (`!` separators, `Object subclass: #Foo …`). No fileIn/fileOut images — text source only.
+- **Conformance:** ANSI X3J20 *as a target*, not bug-for-bug Squeak. "Reads like Smalltalk, runs like Smalltalk."
+- **Test corpus:** SUnit ported to SX-Smalltalk + custom programs + a curated slice of Pharo `Kernel-Tests` / `Collections-Tests`.
+- **Image:** out of scope. Source-only. No `become:` between sessions, no snapshotting.
+- **Reflection:** `class`, `respondsTo:`, `perform:`, `doesNotUnderstand:` in. `become:` (object-identity swap) **in** — it's a good CEK exercise. Method modification at runtime in.
+- **GUI / Morphic / threads:** out entirely.
+
+## Ground rules
+
+- **Scope:** only touch `lib/smalltalk/**` and `plans/smalltalk-on-sx.md`. Don't edit `spec/`, `hosts/`, `shared/`, or any other `lib/<lang>/**`. Smalltalk primitives go in `lib/smalltalk/runtime.sx`.
+- **SX files:** use `sx-tree` MCP tools only.
+- **Commits:** one feature per commit. Keep `## Progress log` updated and tick roadmap boxes.
+
+## Architecture sketch
+
+```
+Smalltalk source
+    │
+    ▼
+lib/smalltalk/tokenizer.sx  — selectors, keywords, literals, $c, #sym, #(…), $'…'
+    │
+    ▼
+lib/smalltalk/parser.sx     — AST: classes, methods, blocks, cascades, sends
+    │
+    ▼
+lib/smalltalk/transpile.sx  — AST → SX AST (entry: smalltalk-eval-ast)
+    │
+    ▼
+lib/smalltalk/runtime.sx    — class table, MOP, dispatch, primitives
+```
+
+Core mapping:
+- **Class** = SX dict `{:name :superclass :ivars :methods :class-methods :metaclass}`. Class table is a flat dict keyed by class name.
+- **Object** = SX dict `{:class :ivars}` — `ivars` keyed by symbol. Tagged ints / floats / strings / symbols are not boxed; their class is looked up by SX type.
+- **Method** = SX lambda closing over a `self` binding + temps. Body wrapped in a delimited continuation so `^` can escape.
+- **Message send** = `(st-send receiver selector args)` — does class-table lookup, walks superclass chain, falls back to `doesNotUnderstand:` with a `Message` object.
+- **Block** `[:x | … ^v … ]` = lambda + captured `^k` (the method-return continuation). Invoking `^` calls `k`; outer block invocation past method return raises `BlockContext>>cannotReturn:`.
+- **Cascade** `r m1; m2; m3` = `(let ((tmp r)) (st-send tmp 'm1 ()) (st-send tmp 'm2 ()) (st-send tmp 'm3 ()))`.
+- **`ifTrue:ifFalse:` / `whileTrue:`** = ordinary block sends; the runtime intrinsifies them in the JIT path so they compile to native branches (Tier 1 of bytecode expansion already covers this pattern).
+- **`become:`** = swap two object identities everywhere — in SX this is a heap walk, but we restrict to `oneWayBecome:` (cheap: rewrite class field) by default.
+
+## Roadmap
+
+### Phase 1 — tokenizer + parser
+- [ ] Tokenizer: identifiers, keywords (`foo:`), binary selectors (`+`, `==`, `,`, `->`, `~=` etc.), numbers (radix `16r1F`, scaled `1.5s2`), strings `'…''…'`, characters `$c`, symbols `#foo` `#'foo bar'` `#+`, byte arrays `#[1 2 3]`, literal arrays `#(1 #foo 'x')`, comments `"…"`
+- [ ] Parser: chunk format (`! !` separators), class definitions (`Object subclass: #X instanceVariableNames: '…' classVariableNames: '…' …`), method definitions (`extend: #Foo with: 'bar ^self'`), pragmas `<primitive: 1>`, blocks `[:a :b | | t1 t2 | …]`, cascades, message precedence (unary > binary > keyword)
+- [ ] Unit tests in `lib/smalltalk/tests/parse.sx`
+
+### Phase 2 — object model + sequential eval
+- [ ] Class table + bootstrap: `Object`, `Behavior`, `Class`, `Metaclass`, `UndefinedObject`, `Boolean`/`True`/`False`, `Number`/`Integer`/`Float`, `String`, `Symbol`, `Array`, `Block`
+- [ ] `smalltalk-eval-ast`: literals, variable reference, assignment, message send, cascade, sequence, return
+- [ ] Method lookup: walk class → superclass; cache hit-class on `(class, selector)`
+- [ ] `doesNotUnderstand:` fallback constructing `Message` object
+- [ ] `super` send (lookup starts at superclass of *defining* class, not receiver class)
+- [ ] 30+ tests in `lib/smalltalk/tests/eval.sx`
+
+### Phase 3 — blocks + non-local return (THE SHOWCASE)
+- [ ] Method invocation captures a `^k` (the return continuation) and binds it as the block's escape
+- [ ] `^expr` from inside a block invokes that captured `^k`
+- [ ] `BlockContext>>value`, `value:`, `value:value:`, …, `valueWithArguments:`
+- [ ] `whileTrue:` / `whileTrue` / `whileFalse:` / `whileFalse` as ordinary block sends — runtime intrinsifies the loop in the bytecode JIT
+- [ ] `ifTrue:` / `ifFalse:` / `ifTrue:ifFalse:` as block sends, similarly intrinsified
+- [ ] Escape past returned-from method raises `BlockContext>>cannotReturn:`
+- [ ] Classic programs in `lib/smalltalk/tests/programs/`:
+  - [ ] `eight-queens.st`
+  - [ ] `quicksort.st`
+  - [ ] `mandelbrot.st`
+  - [ ] `life.st` (Conway's Life, glider gun)
+  - [ ] `fibonacci.st` (recursive + memoised)
+- [ ] `lib/smalltalk/conformance.sh` + runner, `scoreboard.json` + `scoreboard.md`
+
+### Phase 4 — reflection + MOP
+- [ ] `Object>>class`, `class>>name`, `class>>superclass`, `class>>methodDict`, `class>>selectors`
+- [ ] `Object>>perform:` / `perform:with:` / `perform:withArguments:`
+- [ ] `Object>>respondsTo:`, `Object>>isKindOf:`, `Object>>isMemberOf:`
+- [ ] `Behavior>>compile:` — runtime method addition
+- [ ] `Object>>becomeForward:` (one-way become; rewrites the class field of `aReceiver`)
+- [ ] Exceptions: `Exception`, `Error`, `signal`, `signal:`, `on:do:`, `ensure:`, `ifCurtailed:` — built on top of SX `handler-bind`/`raise`
+
+### Phase 5 — collections + numeric tower
+- [ ] `SequenceableCollection`/`OrderedCollection`/`Array`/`String`/`Symbol`
+- [ ] `HashedCollection`/`Set`/`Dictionary`/`IdentityDictionary`
+- [ ] `Stream` hierarchy: `ReadStream`/`WriteStream`/`ReadWriteStream`
+- [ ] `Number` tower: `SmallInteger`/`LargePositiveInteger`/`Float`/`Fraction`
+- [ ] `String>>format:`, `printOn:` for everything
+
+### Phase 6 — SUnit + corpus to 200+
+- [ ] Port SUnit (TestCase, TestSuite, TestResult) — written in SX-Smalltalk, runs in itself
+- [ ] Vendor a slice of Pharo `Kernel-Tests` and `Collections-Tests`
+- [ ] Drive the scoreboard up: aim for 200+ green tests
+- [ ] Stretch: ANSI Smalltalk validator subset
+
+### Phase 7 — speed (optional)
+- [ ] Method-dictionary inline caching (already in CEK as a primitive; just wire selector cache)
+- [ ] Block intrinsification beyond `whileTrue:` / `ifTrue:`
+- [ ] Compare against GNU Smalltalk on the corpus
+
+## Progress log
+
+_Newest first. Agent appends on every commit._
+
+- _(none yet)_
+
+## Blockers
+
+_Shared-file issues that need someone else to fix. Minimal repro only._
+
+- _(none yet)_

plans/tcl-on-sx.md

@@ -0,0 +1,127 @@
+# Tcl-on-SX: uplevel/upvar = stack-walking delcc, everything-is-a-string
+
+The headline showcase is **uplevel/upvar** — Tcl's superpower for defining your own control structures. `uplevel` evaluates a script in the *caller's* stack frame; `upvar` aliases a variable in the caller. On a normal language host this requires deep VM cooperation; on SX it falls out of the env-chain made first-class via captured continuations. Plus the *Dodekalogue* (12 rules), command-substitution everywhere, and "everything is a string" homoiconicity.
+
+End-state goal: Tcl 8.6-flavoured subset, the Dodekalogue parser, namespaces, `try`/`catch`/`return -code`, `coroutine` (built on fibers), classic programs that show off uplevel-driven DSLs, ~150 hand-written tests.
+
+## Scope decisions (defaults — override by editing before we spawn)
+
+- **Syntax:** Tcl 8.6 surface. The 12-rule Dodekalogue. Brace-quoted scripts deferred-evaluate; double-quoted ones substitute.
+- **Conformance:** "Reads like Tcl, runs like Tcl." Slice of Tcl's own test suite, not full TCT.
+- **Test corpus:** custom + curated `tcl-tests/` slice. Plus classic programs: define-your-own `for-each-line`, expression-language compiler-in-Tcl, fiber-based event loop.
+- **Out of scope:** Tk, sockets beyond a stub, threads (mapped to `coroutine` only), `package require` of binary loadables, `dde`/`registry` Windows shims, full `clock format` locale support.
+- **Channels:** `puts` and `gets` on `stdout`/`stdin`/`stderr`; `open` on regular files; no async I/O beyond what `coroutine` gives.
+
+## Ground rules
+
+- **Scope:** only touch `lib/tcl/**` and `plans/tcl-on-sx.md`. Don't edit `spec/`, `hosts/`, `shared/`, or any other `lib/<lang>/**`. Tcl primitives go in `lib/tcl/runtime.sx`.
+- **SX files:** use `sx-tree` MCP tools only.
+- **Commits:** one feature per commit. Keep `## Progress log` updated and tick roadmap boxes.
+
+## Architecture sketch
+
+```
+Tcl source
+    │
+    ▼
+lib/tcl/tokenizer.sx   — the Dodekalogue: words, [..], ${..}, "..", {..}, ;, \n, \, #
+    │
+    ▼
+lib/tcl/parser.sx      — list-of-words AST (script = list of commands; command = list of words)
+    │
+    ▼
+lib/tcl/transpile.sx   — AST → SX AST (entry: tcl-eval-script)
+    │
+    ▼
+lib/tcl/runtime.sx     — env stack, command table, uplevel/upvar, coroutines, BIFs
+```
+
+Core mapping:
+- **Value** = string. Internally we cache a "shimmer" representation (list, dict, integer, double) for performance, but every value can be re-stringified.
+- **Variable** = entry in current frame's env. Frames form a stack; level-0 is the global frame.
+- **Command** = entry in command table; first word of any list dispatches into it. User-defined via `proc`. Built-ins are SX functions registered in the table.
+- **Frame** = `{:locals (dict) :level n :parent frame}`. Each `proc` call pushes a frame; commands run in current frame.
+- **`uplevel #N script`** = walk frame chain to absolute level N (or relative if no `#`); evaluate script in that frame's env.
+- **`upvar [#N] varname localname`** = bind `localname` in the current frame as an alias to `varname` in the level-N frame (env-chain delegate).
+- **`return -code N`** = control flow as integers: 0=ok, 1=error, 2=return, 3=break, 4=continue. `catch` traps any non-zero; `try` adds named handlers.
+- **`coroutine`** = fiber on top of `perform`/`cek-resume`. `yield`/`yieldto` suspend; calling the coroutine command resumes.
+- **List / dict** = list-shaped string ("element1 element2 …") with a cached parsed form. Modifications dirty the string cache.
+
+## Roadmap
+
+### Phase 1 — tokenizer + parser (the Dodekalogue)
+- [ ] Tokenizer applying the 12 rules:
+  1. Commands separated by `;` or newlines
+  2. Words separated by whitespace within a command
+  3. Double-quoted words: `\` escapes + `[…]` + `${…}` + `$var` substitution
+  4. Brace-quoted words: literal, no substitution; brace count must balance
+  5. Argument expansion: `{*}list`
+  6. Command substitution: `[script]` evaluates script, takes its return value
+  7. Variable substitution: `$name`, `${name}`, `$arr(idx)`, `$arr($i)`
+  8. Backslash substitution: `\n`, `\t`, `\\`, `\xNN`, `\uNNNN`, `\<newline>` continues
+  9. Comments: `#` only at the start of a command
+  10. Order of substitution is left-to-right, single-pass
+  11. Substitutions don't recurse — substituted text is not re-parsed
+  12. The result of any substitution is the value, not a new script
+- [ ] Parser: script = list of commands; command = list of words; word = literal string + list of substitutions
+- [ ] Unit tests in `lib/tcl/tests/parse.sx`
+
+### Phase 2 — sequential eval + core commands
+- [ ] `tcl-eval-script`: walk command list, dispatch each first-word into command table
+- [ ] Core commands: `set`, `unset`, `incr`, `append`, `lappend`, `puts`, `gets`, `expr`, `if`, `while`, `for`, `foreach`, `switch`, `break`, `continue`, `return`, `error`, `eval`, `subst`, `format`, `scan`
+- [ ] `expr` is its own mini-language — operator precedence, function calls (`sin`, `sqrt`, `pow`, `abs`, `int`, `double`), variable substitution, command substitution
+- [ ] String commands: `string length`, `string index`, `string range`, `string compare`, `string match`, `string toupper`, `string tolower`, `string trim`, `string map`, `string repeat`, `string first`, `string last`, `string is`, `string cat`
+- [ ] List commands: `list`, `lindex`, `lrange`, `llength`, `lreverse`, `lsearch`, `lsort`, `lsort -integer/-real/-dictionary`, `lreplace`, `linsert`, `concat`, `split`, `join`
+- [ ] Dict commands: `dict create`, `dict get`, `dict set`, `dict unset`, `dict exists`, `dict keys`, `dict values`, `dict size`, `dict for`, `dict update`, `dict merge`
+- [ ] 60+ tests in `lib/tcl/tests/eval.sx`
+
+### Phase 3 — proc + uplevel + upvar (THE SHOWCASE)
+- [ ] `proc name args body` — register user-defined command; args supports defaults `{name default}` and rest `args`
+- [ ] Frame stack: each proc call pushes a frame with locals dict; pop on return
+- [ ] `uplevel ?level? script` — evaluate `script` in level-N frame's env; default level is 1 (caller). `#0` is global, `#1` is relative-1
+- [ ] `upvar ?level? otherVar localVar ?…?` — alias localVar to a variable in level-N frame; reads/writes go through the alias
+- [ ] `info level`, `info level N`, `info frame`, `info vars`, `info locals`, `info globals`, `info commands`, `info procs`, `info args`, `info body`
+- [ ] `global var ?…?` — alias to global frame (sugar for `upvar #0 var var`)
+- [ ] `variable name ?value?` — namespace-scoped global
+- [ ] Classic programs in `lib/tcl/tests/programs/`:
+  - [ ] `for-each-line.tcl` — define your own loop construct using `uplevel`
+  - [ ] `assert.tcl` — assertion macro that reports caller's line
+  - [ ] `with-temp-var.tcl` — scoped variable rebind via `upvar`
+- [ ] `lib/tcl/conformance.sh` + runner, `scoreboard.json` + `scoreboard.md`
+
+### Phase 4 — control flow + error handling
+- [ ] `return -code (ok|error|return|break|continue|N) -errorinfo … -errorcode … -level N value`
+- [ ] `catch script ?resultVar? ?optionsVar?` — runs script, returns code; sets resultVar to return value/message; optionsVar to the dict
+- [ ] `try script ?on code var body ...? ?trap pattern var body...? ?finally body?`
+- [ ] `throw type message`
+- [ ] `error message ?info? ?code?`
+- [ ] Stack-trace with `errorInfo` / `errorCode`
+- [ ] 30+ tests in `lib/tcl/tests/error.sx`
+
+### Phase 5 — namespaces + ensembles
+- [ ] `namespace eval ns body`, `namespace current`, `namespace which`, `namespace import`, `namespace export`, `namespace forget`, `namespace delete`
+- [ ] Qualified names: `::ns::cmd`, `::ns::var`
+- [ ] Ensembles: `namespace ensemble create -map { sub1 cmd1 sub2 cmd2 }`
+- [ ] `namespace path` for resolution chain
+- [ ] `proc` and `variable` work inside namespaces
+
+### Phase 6 — coroutines + drive corpus
+- [ ] `coroutine name cmd ?args…?` — start a coroutine; future calls to `name` resume it
+- [ ] `yield ?value?` — suspend, return value to resumer
+- [ ] `yieldto cmd ?args…?` — symmetric transfer
+- [ ] `coroutine` semantics built on fibers (same delcc primitive as Ruby fibers)
+- [ ] Classic programs: `event-loop.tcl` — cooperative scheduler with multiple coroutines
+- [ ] System: `clock seconds`, `clock format`, `clock scan` (subset)
+- [ ] File I/O: `open`, `close`, `read`, `gets`, `puts -nonewline`, `flush`, `eof`, `seek`, `tell`
+- [ ] Drive corpus to 150+ green
+- [ ] Idiom corpus — `lib/tcl/tests/idioms.sx` covering classic Welch/Jones idioms
+
+## Progress log
+
+_Newest first._
+
+- _(none yet)_
+
+## Blockers
+
+- _(none yet)_

scripts/sx-loops-down.sh

@@ -30,7 +30,7 @@ fi
 
 if [ "$CLEAN" = "1" ]; then
   cd "$(dirname "$0")/.."
-  for lang in lua prolog forth erlang haskell js hs; do
+  for lang in lua prolog forth erlang haskell js hs smalltalk common-lisp apl ruby tcl; do
     wt="$WORKTREE_BASE/$lang"
     if [ -d "$wt" ]; then
       git worktree remove --force "$wt" 2>/dev/null || rm -rf "$wt"
@@ -39,5 +39,5 @@ if [ "$CLEAN" = "1" ]; then
   done
   git worktree prune
   echo "Worktree branches (loops/<lang>) are preserved. Delete manually if desired:"
-  echo "  git branch -D loops/lua loops/prolog loops/forth loops/erlang loops/haskell loops/js loops/hs"
+  echo "  git branch -D loops/lua loops/prolog loops/forth loops/erlang loops/haskell loops/js loops/hs loops/smalltalk loops/common-lisp loops/apl loops/ruby loops/tcl"
 fi

scripts/sx-loops-up.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Spawn 7 claude sessions in tmux, one per language loop.
+# Spawn 12 claude sessions in tmux, one per language loop.
 # Each runs in its own git worktree rooted at /root/rose-ash-loops/<lang>,
 # on branch loops/<lang>. No two loops share a working tree, so there's
 # zero risk of file collisions between languages.
@@ -9,7 +9,7 @@
 #
 # After the script prints done:
 #   tmux a -t sx-loops
-#   Ctrl-B + <window-number> to switch (0=lua ... 6=hs)
+#   Ctrl-B + <window-number> to switch (0=lua ... 11=tcl)
 #   Ctrl-B + d to detach (loops keep running, SSH-safe)
 #
 # Stop: ./scripts/sx-loops-down.sh
@@ -38,8 +38,13 @@ declare -A BRIEFING=(
   [haskell]=haskell-loop.md
   [js]=loop.md
   [hs]=hs-loop.md
+  [smalltalk]=smalltalk-loop.md
+  [common-lisp]=common-lisp-loop.md
+  [apl]=apl-loop.md
+  [ruby]=ruby-loop.md
+  [tcl]=tcl-loop.md
 )
-ORDER=(lua prolog forth erlang haskell js hs)
+ORDER=(lua prolog forth erlang haskell js hs smalltalk common-lisp apl ruby tcl)
 
 mkdir -p "$WORKTREE_BASE"
 
@@ -60,13 +65,13 @@ for lang in "${ORDER[@]}"; do
   fi
 done
 
-# Create tmux session with 7 windows, each cwd in its worktree
+# Create tmux session with one window per language, each cwd in its worktree
 tmux new-session -d -s "$SESSION" -n "${ORDER[0]}" -c "$WORKTREE_BASE/${ORDER[0]}"
 for lang in "${ORDER[@]:1}"; do
   tmux new-window -t "$SESSION" -n "$lang" -c "$WORKTREE_BASE/$lang"
 done
 
-echo "Starting 7 claude sessions..."
+echo "Starting ${#ORDER[@]} claude sessions..."
 for lang in "${ORDER[@]}"; do
   tmux send-keys -t "$SESSION:$lang" "claude" C-m
 done
@@ -89,10 +94,10 @@ for lang in "${ORDER[@]}"; do
 done
 
 echo ""
-echo "Done. 7 loops started in tmux session '$SESSION', each in its own worktree."
+echo "Done. ${#ORDER[@]} loops started in tmux session '$SESSION', each in its own worktree."
 echo ""
 echo "  Attach:    tmux a -t $SESSION"
-echo "  Switch:    Ctrl-B <0..6>  (0=lua 1=prolog 2=forth 3=erlang 4=haskell 5=js 6=hs)"
+echo "  Switch:    Ctrl-B <0..11>  (0=lua 1=prolog 2=forth 3=erlang 4=haskell 5=js 6=hs 7=smalltalk 8=common-lisp 9=apl 10=ruby 11=tcl)"
 echo "  List:      Ctrl-B w"
 echo "  Detach:    Ctrl-B d"
 echo "  Stop:      ./scripts/sx-loops-down.sh"

spec/tests/test-hyperscript-behavioral.sx

@@ -88,6 +88,27 @@
                 (raise _e))))
           (handler me-val))))))
 
+;; Evaluate a hyperscript expression, catch the first error raised, and
+;; return its message string. Used by runtimeErrors tests.
+;; Returns nil if no error is raised (test would then fail equality).
+(define eval-hs-error
+  (fn (src)
+    (let ((sx (hs-to-sx (hs-compile src))))
+      (let ((handler (eval-expr-cek
+              (list (quote fn) (list (quote me))
+                (list (quote let) (list (list (quote it) nil) (list (quote event) nil)) sx)))))
+        (guard
+          (_e
+            (true
+              (if
+                (string? _e)
+                _e
+                (if
+                  (and (list? _e) (= (first _e) "hs-return"))
+                  nil
+                  (str _e)))))
+          (begin (handler nil) nil))))))
+
 ;; ── add (19 tests) ──
 (defsuite "hs-upstream-add"
   (deftest "can add a value to a set"
@@ -2153,41 +2174,75 @@
 ;; ── core/runtimeErrors (18 tests) ──
 (defsuite "hs-upstream-core/runtimeErrors"
   (deftest "reports basic function invocation null errors properly"
-    (error "SKIP (untranslated): reports basic function invocation null errors properly"))
+    (assert= (eval-hs-error "x()") "'x' is null")
+    (assert= (eval-hs-error "x.y()") "'x' is null")
+    (assert= (eval-hs-error "x.y.z()") "'x.y' is null")
+  )
   (deftest "reports basic function invocation null errors properly w/ of"
-    (error "SKIP (untranslated): reports basic function invocation null errors properly w/ of"))
+    (assert= (eval-hs-error "z() of y of x") "'z' is null")
+  )
   (deftest "reports basic function invocation null errors properly w/ possessives"
-    (error "SKIP (untranslated): reports basic function invocation null errors properly w/ possessives"))
+    (assert= (eval-hs-error "x's y()") "'x' is null")
+    (assert= (eval-hs-error "x's y's z()") "'x's y' is null")
+  )
   (deftest "reports null errors on add command properly"
-    (error "SKIP (untranslated): reports null errors on add command properly"))
+    (assert= (eval-hs-error "add .foo to #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "add @foo to #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "add {display:none} to #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on decrement command properly"
-    (error "SKIP (untranslated): reports null errors on decrement command properly"))
+    (assert= (eval-hs-error "decrement #doesntExist's innerHTML") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on default command properly"
-    (error "SKIP (untranslated): reports null errors on default command properly"))
+    (assert= (eval-hs-error "default #doesntExist's innerHTML to 'foo'") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on hide command properly"
-    (error "SKIP (untranslated): reports null errors on hide command properly"))
+    (assert= (eval-hs-error "hide #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on increment command properly"
-    (error "SKIP (untranslated): reports null errors on increment command properly"))
+    (assert= (eval-hs-error "increment #doesntExist's innerHTML") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on measure command properly"
-    (error "SKIP (untranslated): reports null errors on measure command properly"))
+    (assert= (eval-hs-error "measure #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on put command properly"
-    (error "SKIP (untranslated): reports null errors on put command properly"))
+    (assert= (eval-hs-error "put 'foo' into #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "put 'foo' into #doesntExist's innerHTML") "'#doesntExist' is null")
+    (assert= (eval-hs-error "put 'foo' into #doesntExist.innerHTML") "'#doesntExist' is null")
+    (assert= (eval-hs-error "put 'foo' before #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "put 'foo' after #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "put 'foo' at the start of #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "put 'foo' at the end of #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on remove command properly"
-    (error "SKIP (untranslated): reports null errors on remove command properly"))
+    (assert= (eval-hs-error "remove .foo from #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "remove @foo from #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "remove #doesntExist from #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on send command properly"
-    (error "SKIP (untranslated): reports null errors on send command properly"))
+    (assert= (eval-hs-error "send 'foo' to #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on sets properly"
-    (error "SKIP (untranslated): reports null errors on sets properly"))
+    (assert= (eval-hs-error "set x's y to true") "'x' is null")
+    (assert= (eval-hs-error "set x's @y to true") "'x' is null")
+  )
   (deftest "reports null errors on settle command properly"
-    (error "SKIP (untranslated): reports null errors on settle command properly"))
+    (assert= (eval-hs-error "settle #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on show command properly"
-    (error "SKIP (untranslated): reports null errors on show command properly"))
+    (assert= (eval-hs-error "show #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on toggle command properly"
-    (error "SKIP (untranslated): reports null errors on toggle command properly"))
+    (assert= (eval-hs-error "toggle .foo on #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "toggle between .foo and .bar on #doesntExist") "'#doesntExist' is null")
+    (assert= (eval-hs-error "toggle @foo on #doesntExist") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on transition command properly"
-    (error "SKIP (untranslated): reports null errors on transition command properly"))
+    (assert= (eval-hs-error "transition #doesntExist's *visibility to 0") "'#doesntExist' is null")
+  )
   (deftest "reports null errors on trigger command properly"
-    (error "SKIP (untranslated): reports null errors on trigger command properly"))
+    (assert= (eval-hs-error "trigger 'foo' on #doesntExist") "'#doesntExist' is null")
+  )
 )
 
 ;; ── core/scoping (20 tests) ──

tests/playwright/generate-sx-tests.py

@@ -2333,6 +2333,25 @@ def generate_eval_only_test(test, idx):
         hs_expr = extract_hs_expr(m.group(2))
         assertions.append(f'    (assert-throws (eval-hs "{hs_expr}"))')
 
+    # Pattern 4: eval-hs-error — expect(await error("expr")).toBe("msg")
+    # These test that running HS raises an error with a specific message string.
+    for m in re.finditer(
+        r'(?:const\s+\w+\s*=\s*)?(?:await\s+)?error\((["\x27`])(.+?)\1\)'
+        r'(?:[^;]|\n)*?(?:expect\([^)]*\)\.toBe\(([^)]+)\)|\.toBe\(([^)]+)\))',
+        body, re.DOTALL
+    ):
+        hs_expr = extract_hs_expr(m.group(2))
+        expected_raw = (m.group(3) or m.group(4) or '').strip()
+        # Strip only the outermost JS string delimiter (double or single quote)
+        # without touching inner quotes inside the string value.
+        if len(expected_raw) >= 2 and expected_raw[0] == expected_raw[-1] and expected_raw[0] in ('"', "'"):
+            inner = expected_raw[1:-1]
+            expected_sx = '"' + inner.replace('\\', '\\\\').replace('"', '\\"') + '"'
+        else:
+            expected_sx = js_val_to_sx(expected_raw)
+        hs_escaped = hs_expr.replace('\\', '\\\\').replace('"', '\\"')
+        assertions.append(f'    (assert= (eval-hs-error "{hs_escaped}") {expected_sx})')
+
     if not assertions:
         return None  # Can't convert this body pattern
 
@@ -2692,6 +2711,27 @@ output.append('                (nth _e 1)')
 output.append('                (raise _e))))')
 output.append('          (handler me-val))))))')
 output.append('')
+output.append(';; Evaluate a hyperscript expression, catch the first error raised, and')
+output.append(';; return its message string. Used by runtimeErrors tests.')
+output.append(';; Returns nil if no error is raised (test would then fail equality).')
+output.append('(define eval-hs-error')
+output.append('  (fn (src)')
+output.append('    (let ((sx (hs-to-sx (hs-compile src))))')
+output.append('      (let ((handler (eval-expr-cek')
+output.append('              (list (quote fn) (list (quote me))')
+output.append('                (list (quote let) (list (list (quote it) nil) (list (quote event) nil)) sx)))))')
+output.append('        (guard')
+output.append('          (_e')
+output.append('            (true')
+output.append('              (if')
+output.append('                (string? _e)')
+output.append('                _e')
+output.append('                (if')
+output.append('                  (and (list? _e) (= (first _e) "hs-return"))')
+output.append('                  nil')
+output.append('                  (str _e)))))')
+output.append('          (begin (handler nil) nil))))))')
+output.append('')
 
 # Group by category
 categories = OrderedDict()