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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>