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Nested `not(not(P))` silently misparsed: outer `not(...)` is recognised as negation, but the inner `not(banned(X))` was parsed as a positive call to a relation called `not`. With no `not` relation present, the inner match was empty, the outer negation succeeded vacuously, and `vip(X) :- u(X), not(not(banned(X))).` collapsed to `vip(X) :- u(X).` — a silent double-negation = identity fallacy. Fix in `dl-rule-check-safety`: the positive-literal branch and `dl-process-neg!` both reject any body literal whose relation name is in `dl-reserved-rel-names`. Error message names the relation and points the user at stratified negation through an intermediate relation. 1 regression test; conformance 260/260. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
421 B
421 B
datalog scoreboard
260 / 260 passing (0 failure(s)).
| Suite | Passed | Total | Status |
|---|---|---|---|
| tokenize | 30 | 30 | ok |
| parse | 22 | 22 | ok |
| unify | 29 | 29 | ok |
| eval | 39 | 39 | ok |
| builtins | 23 | 23 | ok |
| semi_naive | 8 | 8 | ok |
| negation | 10 | 10 | ok |
| aggregates | 22 | 22 | ok |
| api | 20 | 20 | ok |
| magic | 36 | 36 | ok |
| demo | 21 | 21 | ok |