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normalization: avoid incompletely constraining GAT args

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This commit is contained in:
lcnr
2025-05-06 18:39:07 +00:00
parent 1973872013
commit 31ebe11f61
9 changed files with 111 additions and 23 deletions
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7
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@@ -1760,12 +1760,13 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
if is_match {
let generics = self.tcx().generics_of(obligation.predicate.def_id);
// FIXME(generic-associated-types): Addresses aggressive inference in #92917.
// FIXME(generic_associated_types): Addresses aggressive inference in #92917.
// If this type is a GAT, and of the GAT args resolve to something new,
// that means that we must have newly inferred something about the GAT.
// We should give up in that case.
// FIXME(generic-associated-types): This only detects one layer of inference,
// which is probably not what we actually want, but fixing it causes some ambiguity:
//
// This only detects one layer of inference, which is probably not what we actually
// want, but fixing it causes some ambiguity:
// <https://github.com/rust-lang/rust/issues/125196>.
if !generics.is_own_empty()
&& obligation.predicate.args[generics.parent_count..].iter().any(|&p| {