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>
421 B
421 B
datalog scoreboard
273 / 273 passing (0 failure(s)).
| Suite | Passed | Total | Status |
|---|---|---|---|
| tokenize | 31 | 31 | ok |
| parse | 23 | 23 | ok |
| unify | 29 | 29 | ok |
| eval | 42 | 42 | ok |
| builtins | 26 | 26 | ok |
| semi_naive | 8 | 8 | ok |
| negation | 12 | 12 | ok |
| aggregates | 23 | 23 | ok |
| api | 22 | 22 | ok |
| magic | 36 | 36 | ok |
| demo | 21 | 21 | ok |