diff options
Diffstat (limited to 'compiler/rustc_trait_selection/src/traits/select/mod.rs')
| -rw-r--r-- | compiler/rustc_trait_selection/src/traits/select/mod.rs | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/select/mod.rs b/compiler/rustc_trait_selection/src/traits/select/mod.rs index 4ce37db4280..7f1fe481ca7 100644 --- a/compiler/rustc_trait_selection/src/traits/select/mod.rs +++ b/compiler/rustc_trait_selection/src/traits/select/mod.rs @@ -27,8 +27,8 @@ use rustc_middle::ty::abstract_const::NotConstEvaluatable; use rustc_middle::ty::error::TypeErrorToStringExt; use rustc_middle::ty::print::{PrintTraitRefExt as _, with_no_trimmed_paths}; use rustc_middle::ty::{ - self, GenericArgsRef, PolyProjectionPredicate, Ty, TyCtxt, TypeFoldable, TypeVisitableExt, - TypingMode, Upcast, elaborate, + self, DeepRejectCtxt, GenericArgsRef, PolyProjectionPredicate, Ty, TyCtxt, TypeFoldable, + TypeVisitableExt, TypingMode, Upcast, elaborate, }; use rustc_span::{Symbol, sym}; use tracing::{debug, instrument, trace}; @@ -1669,6 +1669,12 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> { return Err(()); } + let drcx = DeepRejectCtxt::relate_rigid_rigid(self.infcx.tcx); + let obligation_args = obligation.predicate.skip_binder().trait_ref.args; + if !drcx.args_may_unify(obligation_args, trait_bound.skip_binder().args) { + return Err(()); + } + let trait_bound = self.infcx.instantiate_binder_with_fresh_vars( obligation.cause.span, HigherRankedType, @@ -1760,12 +1766,13 @@ 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| { |