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(p X _), (p _ Y) — the two _ are now different variables, matching standard Datalog semantics. Previously both _ symbols were the same SX symbol, so unification across them gave wrong answers. Fix in db.sx: dl-rename-anon-term + dl-rename-anon-lit walk a term or literal and replace each '_' symbol with a fresh _anon<N>. dl-make-anon-renamer returns a counter-based name generator scoped per call. dl-rename-anon-rule applies it to head and body of a rule. dl-add-rule! invokes the renamer before safety check. eval.sx: dl-query renames anon vars in the goal before search and filters '_' out of the projection so user-facing results aren't polluted with internal _anon<N> bindings. The previous "underscore in head ok" test now correctly rejects (p X _) :- q(X) as unsafe (the head's fresh anon var has no body binder). New "underscore in body only" test confirms the safe case. Two regression tests for rule-level and goal-level independence.
20 lines
717 B
JSON
20 lines
717 B
JSON
{
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"lang": "datalog",
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"total_passed": 156,
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"total_failed": 0,
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"total": 156,
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"suites": [
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{"name":"tokenize","passed":26,"failed":0,"total":26},
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{"name":"parse","passed":18,"failed":0,"total":18},
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{"name":"unify","passed":28,"failed":0,"total":28},
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{"name":"eval","passed":18,"failed":0,"total":18},
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{"name":"builtins","passed":19,"failed":0,"total":19},
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{"name":"semi_naive","passed":8,"failed":0,"total":8},
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{"name":"negation","passed":10,"failed":0,"total":10},
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{"name":"aggregates","passed":10,"failed":0,"total":10},
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{"name":"api","passed":9,"failed":0,"total":9},
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{"name":"demo","passed":10,"failed":0,"total":10}
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],
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"generated": "2026-05-08T08:57:57+00:00"
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}
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