datalog: built-in-only query goals (236/236)

lib/datalog/scoreboard.json

@@ -1,14 +1,14 @@
 {
   "lang": "datalog",
-  "total_passed": 233,
+  "total_passed": 236,
   "total_failed": 0,
-  "total": 233,
+  "total": 236,
   "suites": [
     {"name":"tokenize","passed":26,"failed":0,"total":26},
     {"name":"parse","passed":20,"failed":0,"total":20},
     {"name":"unify","passed":28,"failed":0,"total":28},
     {"name":"eval","passed":32,"failed":0,"total":32},
-    {"name":"builtins","passed":20,"failed":0,"total":20},
+    {"name":"builtins","passed":23,"failed":0,"total":23},
     {"name":"semi_naive","passed":8,"failed":0,"total":8},
     {"name":"negation","passed":10,"failed":0,"total":10},
     {"name":"aggregates","passed":20,"failed":0,"total":20},
@@ -16,5 +16,5 @@
     {"name":"magic","passed":28,"failed":0,"total":28},
     {"name":"demo","passed":21,"failed":0,"total":21}
   ],
-  "generated": "2026-05-08T14:16:19+00:00"
+  "generated": "2026-05-08T14:19:14+00:00"
 }

lib/datalog/scoreboard.md

@@ -1,6 +1,6 @@
 # datalog scoreboard
 
-**233 / 233 passing** (0 failure(s)).
+**236 / 236 passing** (0 failure(s)).
 
 | Suite | Passed | Total | Status |
 |-------|--------|-------|--------|
@@ -8,7 +8,7 @@
 | parse | 20 | 20 | ok |
 | unify | 28 | 28 | ok |
 | eval | 32 | 32 | ok |
-| builtins | 20 | 20 | ok |
+| builtins | 23 | 23 | ok |
 | semi_naive | 8 | 8 | ok |
 | negation | 10 | 10 | ok |
 | aggregates | 20 | 20 | ok |

lib/datalog/tests/builtins.sx

@@ -179,6 +179,20 @@
           ((db (dl-program "n(0). n(1). n(2). n(3). n(4). n(5). n(6). n(7). n(8). n(9).\n                  big(X) :- n(X), >=(X, 5).")))
           (do (dl-saturate! db) (len (dl-relation db "big"))))
         5)
+      ;; Built-in / arithmetic literals work as standalone query goals
+      ;; (without needing a wrapper rule).
+      (dl-bt-test-set! "comparison-only goal true"
+        (dl-eval "" "?- <(1, 2).")
+        (list {}))
+
+      (dl-bt-test-set! "comparison-only goal false"
+        (dl-eval "" "?- <(2, 1).")
+        (list))
+
+      (dl-bt-test-set! "is goal binds"
+        (dl-eval "" "?- is(N, +(2, 3)).")
+        (list {:N 5}))
+
       ;; Bounded successor: a recursive rule with a comparison
       ;; guard terminates because the Herbrand base is effectively
       ;; bounded.