take opaq types

1 files changed, 6 insertions, 3 deletions

diff --git a/compiler/rustc_trait_selection/src/traits/codegen.rs b/compiler/rustc_trait_selection/src/traits/codegen.rs
index 6ca630b74cc..c2b2e319951 100644
--- a/compiler/rustc_trait_selection/src/traits/codegen.rs
+++ b/compiler/rustc_trait_selection/src/traits/codegen.rs
@@ -3,7 +3,7 @@
 // seems likely that they should eventually be merged into more
 // general routines.
 
-use crate::infer::TyCtxtInferExt;
+use crate::infer::{DefiningAnchor, TyCtxtInferExt};
 use crate::traits::{
     FulfillmentContext, ImplSource, Obligation, ObligationCause, SelectionContext, TraitEngine,
     Unimplemented,
@@ -30,7 +30,9 @@ pub fn codegen_fulfill_obligation<'tcx>(
 
     // Do the initial selection for the obligation. This yields the
     // shallow result we are looking for -- that is, what specific impl.
-    tcx.infer_ctxt().enter(|infcx| {
+    tcx.infer_ctxt().with_opaque_type_inference(DefiningAnchor::Bubble).enter(|infcx| {
+        //~^ HACK `Bubble` is required for
+        // this test to pass: type-alias-impl-trait/assoc-projection-ice.rs
         let mut selcx = SelectionContext::new(&infcx);
 
         let obligation_cause = ObligationCause::dummy();
@@ -69,7 +71,8 @@ pub fn codegen_fulfill_obligation<'tcx>(
 
         // Opaque types may have gotten their hidden types constrained, but we can ignore them safely
         // as they will get constrained elsewhere, too.
-        let _opaque_types = infcx.inner.borrow_mut().opaque_type_storage.take_opaque_types();
+        // (ouz-a) This is required for `type-alias-impl-trait/assoc-projection-ice.rs` to pass
+        let _ = infcx.inner.borrow_mut().opaque_type_storage.take_opaque_types();
 
         debug!("Cache miss: {trait_ref:?} => {impl_source:?}");
         Ok(&*tcx.arena.alloc(impl_source))