Python
/
ruff
mirror of https://github.com/astral-sh/ruff
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

don't create T ≤ T constraints

This commit is contained in:
Douglas Creager 2025-11-24 19:41:34 -05:00
parent 93e71be357
commit 312c4ce5c8
1 changed files with 22 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
crates/ty_python_semantic/src/types/constraints.rs
View File

@ -2715,17 +2715,36 @@ impl<'db> SequentMap<'db> {
let left_upper = left_constraint.upper(db);
let right_lower = right_constraint.lower(db);
let right_upper = right_constraint.upper(db);
let new_constraint = |bound_typevar: BoundTypeVarInstance<'db>,
right_lower: Type<'db>,
right_upper: Type<'db>| {
let right_lower = if let Type::TypeVar(other_bound_typevar) = right_lower
&& bound_typevar.is_same_typevar_as(db, other_bound_typevar)
{
Type::Never
} else {
right_lower
};
let right_upper = if let Type::TypeVar(other_bound_typevar) = right_upper
&& bound_typevar.is_same_typevar_as(db, other_bound_typevar)
{
Type::object()
} else {
right_upper
};
ConstrainedTypeVar::new(db, bound_typevar, right_lower, right_upper)
};
let post_constraint = match (left_lower, left_upper) {
(Type::TypeVar(bound_typevar), Type::TypeVar(other_bound_typevar))
if bound_typevar.is_same_typevar_as(db, other_bound_typevar) =>
{
ConstrainedTypeVar::new(db, bound_typevar, right_lower, right_upper)
new_constraint(bound_typevar, right_lower, right_upper)
}
(Type::TypeVar(bound_typevar), _) => {
ConstrainedTypeVar::new(db, bound_typevar, Type::Never, right_upper)
new_constraint(bound_typevar, Type::Never, right_upper)
}
(_, Type::TypeVar(bound_typevar)) => {
ConstrainedTypeVar::new(db, bound_typevar, right_lower, Type::object())
new_constraint(bound_typevar, right_lower, Type::object())
}
_ => return,
};