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[ty] Allow tuple[Any, ...] to assign to tuple[int, *tuple[int, ...]] (#21803)

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## Summary

Closes https://github.com/astral-sh/ty/issues/1750.
This commit is contained in:
Charlie Marsh
2025-12-05 11:04:23 -08:00
committed by GitHub
parent 9714c589e1
commit ef45c97dab
2 changed files with 40 additions and 6 deletions
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36
crates/ty_python_semantic/src/types/tuple.rs
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@@ -998,10 +998,22 @@ impl<'db> VariableLengthTuple<Type<'db>> {
relation_visitor,
disjointness_visitor,
),
EitherOrBoth::Right(_) => {
EitherOrBoth::Right(other_ty) => {
// The rhs has a required element that the lhs is not guaranteed to
// provide.
return ConstraintSet::from(false);
// provide, unless the lhs has a dynamic variable-length portion
// that can materialize to provide it (for assignability only),
// as in `tuple[Any, ...]` matching `tuple[int, int]`.
if !relation.is_assignability() || !self.variable.is_dynamic() {
return ConstraintSet::from(false);
}
self.variable.has_relation_to_impl(
db,
other_ty,
inferable,
relation,
relation_visitor,
disjointness_visitor,
)
}
};
if result
@@ -1037,10 +1049,22 @@ impl<'db> VariableLengthTuple<Type<'db>> {
relation_visitor,
disjointness_visitor,
),
EitherOrBoth::Right(_) => {
EitherOrBoth::Right(other_ty) => {
// The rhs has a required element that the lhs is not guaranteed to
// provide.
return ConstraintSet::from(false);
// provide, unless the lhs has a dynamic variable-length portion
// that can materialize to provide it (for assignability only),
// as in `tuple[Any, ...]` matching `tuple[int, int]`.
if !relation.is_assignability() || !self.variable.is_dynamic() {
return ConstraintSet::from(false);
}
self.variable.has_relation_to_impl(
db,
*other_ty,
inferable,
relation,
relation_visitor,
disjointness_visitor,
)
}
};
if result