4 files changed, 8 insertions, 15 deletions
diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index 4e87ec86658..afdc47ab872 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -237,12 +237,14 @@ pub fn unexpected_hidden_region_diagnostic<'tcx>(
     span: Span,
     hidden_ty: Ty<'tcx>,
     hidden_region: ty::Region<'tcx>,
+    opaque_ty: ty::OpaqueTypeKey<'tcx>,
 ) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
+    let opaque_ty = tcx.mk_opaque(opaque_ty.def_id.to_def_id(), opaque_ty.substs);
     let mut err = struct_span_err!(
         tcx.sess,
         span,
         E0700,
-        "hidden type for `impl Trait` captures lifetime that does not appear in bounds",
+        "hidden type for `{opaque_ty}` captures lifetime that does not appear in bounds",
     );
 
     // Explain the region we are capturing.
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index 85692e109be..d97c7c75b76 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -974,14 +974,14 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     #[instrument(skip(self), level = "debug")]
     pub fn member_constraint(
         &self,
-        opaque_type_def_id: LocalDefId,
+        key: ty::OpaqueTypeKey<'tcx>,
         definition_span: Span,
         hidden_ty: Ty<'tcx>,
         region: ty::Region<'tcx>,
         in_regions: &Lrc<Vec<ty::Region<'tcx>>>,
     ) {
         self.inner.borrow_mut().unwrap_region_constraints().member_constraint(
-            opaque_type_def_id,
+            key,
             definition_span,
             hidden_ty,
             region,
diff --git a/compiler/rustc_infer/src/infer/opaque_types.rs b/compiler/rustc_infer/src/infer/opaque_types.rs
index 7b0ff9552a3..a6c5ed579c7 100644
--- a/compiler/rustc_infer/src/infer/opaque_types.rs
+++ b/compiler/rustc_infer/src/infer/opaque_types.rs
@@ -394,15 +394,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         );
 
         concrete_ty.visit_with(&mut ConstrainOpaqueTypeRegionVisitor {
-            op: |r| {
-                self.member_constraint(
-                    opaque_type_key.def_id,
-                    span,
-                    concrete_ty,
-                    r,
-                    &choice_regions,
-                )
-            },
+            op: |r| self.member_constraint(opaque_type_key, span, concrete_ty, r, &choice_regions),
         });
     }
 
diff --git a/compiler/rustc_infer/src/infer/region_constraints/mod.rs b/compiler/rustc_infer/src/infer/region_constraints/mod.rs
index 551f398e0c2..0d4472a1cfd 100644
--- a/compiler/rustc_infer/src/infer/region_constraints/mod.rs
+++ b/compiler/rustc_infer/src/infer/region_constraints/mod.rs
@@ -12,7 +12,6 @@ use rustc_data_structures::intern::Interned;
 use rustc_data_structures::sync::Lrc;
 use rustc_data_structures::undo_log::UndoLogs;
 use rustc_data_structures::unify as ut;
-use rustc_hir::def_id::LocalDefId;
 use rustc_index::vec::IndexVec;
 use rustc_middle::infer::unify_key::{RegionVidKey, UnifiedRegion};
 use rustc_middle::ty::ReStatic;
@@ -533,7 +532,7 @@ impl<'tcx> RegionConstraintCollector<'_, 'tcx> {
 
     pub fn member_constraint(
         &mut self,
-        opaque_type_def_id: LocalDefId,
+        key: ty::OpaqueTypeKey<'tcx>,
         definition_span: Span,
         hidden_ty: Ty<'tcx>,
         member_region: ty::Region<'tcx>,
@@ -546,7 +545,7 @@ impl<'tcx> RegionConstraintCollector<'_, 'tcx> {
         }
 
         self.data.member_constraints.push(MemberConstraint {
-            opaque_type_def_id,
+            key,
             definition_span,
             hidden_ty,
             member_region,