ocaml: phase 5.1 baseline 8/8 — quicksort + exceptions + closures

Added 3 baseline programs:
- closures.ml — curried make_adder; verifies closure capture
- quicksort.ml — recursive sort using List.filter + List.append, sums result
- exception_handle.ml — exception NegArg of int + raise + try/with

All 8/8 baseline programs pass through ocaml-run-program. Combined the
suite exercises: let-rec, modules, refs, for-loops, pattern matching,
exceptions, lambdas, list ops (map/filter/append/fold), arithmetic.

run.sh streamlined to one sx_server invocation per program. End-to-end
runtime ≈2 min.

lib/ocaml/baseline/closures.ml

@@ -0,0 +1,5 @@
+(* Baseline: closures + curried application *)
+let make_adder n = fun x -> n + x ;;
+let add5 = make_adder 5 ;;
+let add10 = make_adder 10 ;;
+add5 100 + add10 200

lib/ocaml/baseline/exception_handle.ml

@@ -0,0 +1,17 @@
+(* Baseline: exception declaration + raise + try-with *)
+exception NegArg of int ;;
+let safe_sqrt n =
+  if n < 0 then raise (NegArg n)
+  else
+    begin
+      let rec find_sqrt i =
+        if i * i > n then i - 1
+        else find_sqrt (i + 1)
+      in find_sqrt 0
+    end ;;
+let result =
+  try
+    safe_sqrt 16
+  with
+  | NegArg _ -> 0 ;;
+result

lib/ocaml/baseline/expected.json

@@ -1,7 +1,10 @@
 {
+  "closures.ml": 315,
+  "exception_handle.ml": 4,
   "factorial.ml": 3628800,
   "list_ops.ml": 30,
-  "option_match.ml": 5,
   "module_use.ml": 3,
+  "option_match.ml": 5,
+  "quicksort.ml": 44,
   "sum_squares.ml": 385
 }

lib/ocaml/baseline/quicksort.ml

@@ -0,0 +1,10 @@
+(* Baseline: quicksort over a list, returns sum of sorted result *)
+let rec quicksort lst =
+  match lst with
+  | [] -> []
+  | pivot :: rest ->
+    let smaller = List.filter (fun x -> x < pivot) rest in
+    let larger = List.filter (fun x -> x >= pivot) rest in
+    List.append (quicksort smaller) (pivot :: quicksort larger) ;;
+let sorted = quicksort [3; 1; 4; 1; 5; 9; 2; 6; 5; 3; 5] ;;
+List.fold_left (fun a b -> a + b) 0 sorted

lib/ocaml/baseline/run.sh

@@ -22,25 +22,7 @@ for f in lib/ocaml/baseline/*.ml; do
   fi
 
   TMP=$(mktemp)
-  cat > "$TMP" << EPOCHS
+  cat > "$TMP" << EOF
-(epoch 1)
-(load "lib/guest/lex.sx")
-(load "lib/guest/prefix.sx")
-(load "lib/guest/pratt.sx")
-(load "lib/ocaml/tokenizer.sx")
-(load "lib/ocaml/parser.sx")
-(load "lib/ocaml/eval.sx")
-(load "lib/ocaml/runtime.sx")
-(eval "(ocaml-load-stdlib!)")
-(epoch 2)
-(eval "(ocaml-run-program (file-read \\"$f\\"))")
-EPOCHS
-
-  output=$(timeout 60 "$SX_SERVER" < "$TMP" 2>/dev/null | grep -E '^\(ok-len 2|^\(ok 2' | head -1)
-  rm -f "$TMP"
-
-  # Pull the next line which has the value
-  result=$(timeout 60 "$SX_SERVER" < <(cat <<EPOCHS
 (epoch 1)
 (load "lib/guest/lex.sx")
 (load "lib/guest/prefix.sx")
@@ -52,8 +34,15 @@ EPOCHS
 (eval "(ocaml-load-stdlib!)")
 (epoch 2)
 (eval "(ocaml-run-program (file-read \"$f\"))")
-EPOCHS
+EOF
-) 2>/dev/null | awk '/^\(ok-len 2 / {getline; print; exit} /^\(ok 2 / {sub(/^\(ok 2 /, ""); sub(/\)$/, ""); print; exit}')
+
+  output=$(timeout 60 "$SX_SERVER" < "$TMP" 2>/dev/null)
+  rm -f "$TMP"
+
+  result=$(echo "$output" | awk '
+    /^\(ok-len 2 / { getline; print; exit }
+    /^\(ok 2 [^)]+\)$/ { sub(/^\(ok 2 /, ""); sub(/\)$/, ""); print; exit }
+  ')
 
   if [ "$result" = "$expected" ]; then
     PASS=$((PASS + 1))

plans/ocaml-on-sx.md

@@ -372,6 +372,13 @@ the "mother tongue" closure: OCaml → SX → OCaml. This means:
 
 _Newest first._
 
+- 2026-05-08 Phase 5.1 — baseline expanded to 8 programs (8/8 pass).
+  Added: closures.ml (curried adders), quicksort.ml (recursive sort
+  on lists), exception_handle.ml (exception decl + raise + try/with).
+  All 8 programs together exercise let-rec, modules, refs, for-loops,
+  pattern matching, exceptions, lambdas, list functions, arithmetic.
+  Run.sh streamlined to one sx_server invocation per program (was
+  two). End-to-end runtime ≈2 min for the suite.
 - 2026-05-08 Phase 5.1 — `lib/ocaml/baseline/` with five sample OCaml
   programs (.ml files), driven by `lib/ocaml/baseline/run.sh` through
   `ocaml-run-program (file-read F)`. All 5/5 pass: factorial,