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[ty] Ensure that T is disjoint from ~T even when T is a TypeVar (#17922)

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Same as https://github.com/astral-sh/ruff/pull/17910 but for
disjointness
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Alex Waygood 2025-05-07 18:59:16 +01:00 • committed by GitHub
parent 74fe7982ba
commit 895b6161a6
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2 changed files with 11 additions and 5 deletions
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7
crates/ty_python_semantic/src/types.rs
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@ -1643,6 +1643,13 @@ impl<'db> Type<'db> {
false
}
(tvar @ Type::TypeVar(_), Type::Intersection(intersection))
| (Type::Intersection(intersection), tvar @ Type::TypeVar(_))
if intersection.negative(db).contains(&tvar) =>
{
true
}
// An unbounded typevar is never disjoint from any other type, since it might be
// specialized to any type. A bounded typevar is not disjoint from its bound, and is
// only disjoint from other types if its bound is. A constrained typevar is disjoint