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still convincing myself of this

This commit is contained in:
Douglas Creager 2025-11-24 15:37:00 -05:00
parent 3bc3cedac8
commit 55f260868d
1 changed files with 10 additions and 1 deletions
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11
crates/ty_python_semantic/src/types/constraints.rs
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@ -1106,7 +1106,16 @@ impl<'db> Node<'db> {
.get_typevar_dependencies(typevar.identity(db)) .get_typevar_dependencies(typevar.identity(db))
.filter(|dep| inferable_ids.contains(dep)); .filter(|dep| inferable_ids.contains(dep));
let inferable_dependencies: Vec<_> = inferable_dependencies.collect(); let inferable_dependencies: Vec<_> = inferable_dependencies.collect();
let restricted = self.exists(db, inferable_dependencies.iter().copied()); let mut restricted = self.exists(db, inferable_dependencies.iter().copied());
// If this non-inferable typevar depends on any inferable typevars, we are allowed
// to pick different specializations of those inferable typevars for each
// specialization of this non-inferable one. Existentially abstract them away.
// If any constraints on this typevar remain after abstracting its inferable
// dependencies, they are independent of those inferable typevars, so it is safe to
// existentially abstract this typevar as well.
if !inferable_dependencies.is_empty() {
restricted = restricted.exists_one(db, typevar.identity(db));
}
// Complicating things, the typevar might have gradual constraints. For those, we // Complicating things, the typevar might have gradual constraints. For those, we
// need to know the range of valid materializations, but we only need some // need to know the range of valid materializations, but we only need some