[red-knot] don't remove negations when simplifying constrained typevars #17189
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dcreager
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Apr 4, 2025
* main: [red-knot] Empty tuple is always-falsy (#17213) Run fuzzer with `--preview` (#17210) Bump 0.11.4 (#17212) [syntax-errors] Allow `yield` in base classes and annotations (#17206) Don't skip visiting non-tuple slice in `typing.Annotated` subscripts (#17201) [red-knot] mypy_primer: do not specify Python version (#17200) [red-knot] Add `Type.definition` method (#17153) Implement `Invalid rule provided` as rule RUF102 with `--fix` (#17138) [red-knot] Add basic on-hover to playground and LSP (#17057) [red-knot] don't remove negations when simplifying constrained typevars (#17189) [minor] Fix extra semicolon for clippy (#17188) [syntax-errors] Invalid syntax in annotations (#17101) [syntax-errors] Duplicate attributes in match class pattern (#17186) [syntax-errors] Fix multiple assignment for class keyword argument (#17184) use astral-sh/cargo-dist instead (#17187) Enable overindented docs lint (#17182)
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For two non-disjoint types
PandQ, the simplification of(P | Q) & ~Qis notP, butP & ~Q. In other words, the non-empty setP & Qis also excluded from the type.The same applies for a constrained typevar
[T: (P, Q)]:T & ~Qshould simplify toP & ~Q, not justP.Implementing this is actually purely a matter of removing code from the constrained typevar simplification logic; we just need to not bother removing the negations. If the negations are actually redundant (because the constraint types are disjoint), normal intersection simplification will already eliminate them (as shown in the added test.)