giles
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The canonical Datalog idiom for "no X has any Y": orphan(X) :- person(X), not(parent(X, _)). was rejected by the safety check with "negation refers to unbound variable(s) (\"_anon1\")". The parser renames each anonymous `_` to a fresh `_anon*` symbol so multiple `_` occurrences don't unify with each other, and the negation safety walk then demanded all free vars in the negated lit be bound by an earlier positive body lit — including the renamed anonymous vars. Anonymous vars in a negation are existentially quantified within the negation, not requirements from outside. Added dl-non-anon-vars to strip `_anon*` names from the `needed` set before the binding check in dl-process-neg!. Real vars (like `X` in the orphan idiom) still must be bound by an earlier positive body lit, just as before. 2 new regression tests (orphan idiom + multi-anon "solo" pattern); conformance 273/273. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>