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autoderef: completely resolve and deduplicate types

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Ryo Yoshida 2023-06-11 19:12:02 +09:00
parent b7497fcdfa
commit b4795507e3
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3 changed files with 69 additions and 5 deletions
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8
crates/hir/src/lib.rs
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@ -3795,14 +3795,16 @@ impl Type {
}
}
pub fn autoderef<'a>(&'a self, db: &'a dyn HirDatabase) -> impl Iterator<Item = Type> + 'a {
/// Returns types that this type dereferences to (including this type itself). The returned
/// iterator won't yield the same type more than once even if the deref chain contains a cycle.
pub fn autoderef(&self, db: &dyn HirDatabase) -> impl Iterator<Item = Type> + '_ {
self.autoderef_(db).map(move |ty| self.derived(ty))
}
fn autoderef_<'a>(&'a self, db: &'a dyn HirDatabase) -> impl Iterator<Item = Ty> + 'a {
fn autoderef_(&self, db: &dyn HirDatabase) -> impl Iterator<Item = Ty> {
// There should be no inference vars in types passed here
let canonical = hir_ty::replace_errors_with_variables(&self.ty);
autoderef(db, self.env.clone(), canonical).map(|canonical| canonical.value)
autoderef(db, self.env.clone(), canonical)
}
// This would be nicer if it just returned an iterator, but that runs into