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don't pivot on never or object

This commit is contained in:
Douglas Creager 2025-12-07 14:38:19 -05:00
parent ecb9c1301b
commit 22c7fc4516
1 changed files with 6 additions and 2 deletions
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8
crates/ty_python_semantic/src/types/constraints.rs
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@ -2655,14 +2655,18 @@ impl<'db> SequentMap<'db> {
// (CL ≤ C ≤ pivot) ∧ (pivot ≤ B ≤ BU) → (CL ≤ C ≤ B)
(constrained_lower, constrained_upper)
if constrained_upper == bound_constraint.lower(db) =>
if constrained_upper == bound_constraint.lower(db)
&& !constrained_upper.is_never()
&& !constrained_upper.is_object() =>
{
(constrained_lower, Type::TypeVar(bound_typevar))
}
// (pivot ≤ C ≤ CU) ∧ (BL ≤ B ≤ pivot) → (B ≤ C ≤ CU)
(constrained_lower, constrained_upper)
if constrained_lower == bound_constraint.upper(db) =>
if constrained_lower == bound_constraint.upper(db)
&& !constrained_lower.is_never()
&& !constrained_lower.is_object() =>
{
(Type::TypeVar(bound_typevar), constrained_upper)
}