Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 24 insertions, 9 deletions

diff --git a/compiler/rustc_infer/src/infer/outlives/mod.rs b/compiler/rustc_infer/src/infer/outlives/mod.rs
index 2d19d1823..4daa25767 100644
--- a/compiler/rustc_infer/src/infer/outlives/mod.rs
+++ b/compiler/rustc_infer/src/infer/outlives/mod.rs
@@ -19,19 +19,21 @@ pub fn explicit_outlives_bounds<'tcx>(
         .map(ty::Predicate::kind)
         .filter_map(ty::Binder::no_bound_vars)
         .filter_map(move |kind| match kind {
-            ty::PredicateKind::Projection(..)
-            | ty::PredicateKind::Trait(..)
+            ty::PredicateKind::Clause(ty::Clause::Projection(..))
+            | ty::PredicateKind::Clause(ty::Clause::Trait(..))
             | ty::PredicateKind::Coerce(..)
             | ty::PredicateKind::Subtype(..)
             | ty::PredicateKind::WellFormed(..)
             | ty::PredicateKind::ObjectSafe(..)
             | ty::PredicateKind::ClosureKind(..)
-            | ty::PredicateKind::TypeOutlives(..)
+            | ty::PredicateKind::Clause(ty::Clause::TypeOutlives(..))
             | ty::PredicateKind::ConstEvaluatable(..)
             | ty::PredicateKind::ConstEquate(..)
+            | ty::PredicateKind::Ambiguous
             | ty::PredicateKind::TypeWellFormedFromEnv(..) => None,
-            ty::PredicateKind::RegionOutlives(ty::OutlivesPredicate(r_a, r_b)) => {
-                Some(OutlivesBound::RegionSubRegion(r_b, r_a))
-            }
+            ty::PredicateKind::Clause(ty::Clause::RegionOutlives(ty::OutlivesPredicate(
+                r_a,
+                r_b,
+            ))) => Some(OutlivesBound::RegionSubRegion(r_b, r_a)),
         })
 }
diff --git a/compiler/rustc_infer/src/infer/outlives/obligations.rs b/compiler/rustc_infer/src/infer/outlives/obligations.rs
index 6ca884799..abb46ce3b 100644
--- a/compiler/rustc_infer/src/infer/outlives/obligations.rs
+++ b/compiler/rustc_infer/src/infer/outlives/obligations.rs
@@ -68,6 +68,7 @@ use crate::infer::{
 };
 use crate::traits::{ObligationCause, ObligationCauseCode};
 use rustc_data_structures::undo_log::UndoLogs;
+use rustc_errors::ErrorGuaranteed;
 use rustc_hir::def_id::DefId;
 use rustc_hir::def_id::LocalDefId;
 use rustc_middle::mir::ConstraintCategory;
@@ -177,7 +178,7 @@ impl<'tcx> InferCtxt<'tcx> {
         &self,
         generic_param_scope: LocalDefId,
         outlives_env: &OutlivesEnvironment<'tcx>,
-    ) {
+    ) -> Option<ErrorGuaranteed> {
         self.process_registered_region_obligations(
             outlives_env.region_bound_pairs(),
             outlives_env.param_env,
diff --git a/compiler/rustc_infer/src/infer/outlives/test_type_match.rs b/compiler/rustc_infer/src/infer/outlives/test_type_match.rs
index a5c21f0fb..10b474efd 100644
--- a/compiler/rustc_infer/src/infer/outlives/test_type_match.rs
+++ b/compiler/rustc_infer/src/infer/outlives/test_type_match.rs
@@ -136,6 +136,11 @@ impl<'tcx> TypeRelation<'tcx> for Match<'tcx> {
     fn tag(&self) -> &'static str {
         "Match"
     }
+
+    fn intercrate(&self) -> bool {
+        false
+    }
+
     fn tcx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }
@@ -146,14 +151,21 @@ impl<'tcx> TypeRelation<'tcx> for Match<'tcx> {
         true
     } // irrelevant
 
+    fn mark_ambiguous(&mut self) {
+        bug!()
+    }
+
+    #[instrument(level = "trace", skip(self))]
     fn relate_with_variance<T: Relate<'tcx>>(
         &mut self,
-        _: ty::Variance,
+        variance: ty::Variance,
         _: ty::VarianceDiagInfo<'tcx>,
         a: T,
         b: T,
     ) -> RelateResult<'tcx, T> {
-        self.relate(a, b)
+        // Opaque types substs have lifetime parameters.
+        // We must not check them to be equal, as we never insert anything to make them so.
+        if variance != ty::Bivariant { self.relate(a, b) } else { Ok(a) }
     }
 
     #[instrument(skip(self), level = "debug")]