giles
5a1dc4392f
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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.
394 B
394 B
datalog scoreboard
156 / 156 passing (0 failure(s)).
| Suite | Passed | Total | Status |
|---|---|---|---|
| tokenize | 26 | 26 | ok |
| parse | 18 | 18 | ok |
| unify | 28 | 28 | ok |
| eval | 18 | 18 | ok |
| builtins | 19 | 19 | ok |
| semi_naive | 8 | 8 | ok |
| negation | 10 | 10 | ok |
| aggregates | 10 | 10 | ok |
| api | 9 | 9 | ok |
| demo | 10 | 10 | ok |