1 files changed, 21 insertions, 1 deletions
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index de35e5e847c..a3fdd4e35b6 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -487,7 +487,23 @@ impl<'tcx> Ty<'tcx> {
         {
             ty
         } else {
-            Ty::new(tcx, Bound(index, bound_ty))
+            Ty::new(tcx, Bound(ty::BoundVarIndexKind::Bound(index), bound_ty))
+        }
+    }
+
+    #[inline]
+    pub fn new_canonical_bound(tcx: TyCtxt<'tcx>, var: BoundVar) -> Ty<'tcx> {
+        // Use a pre-interned one when possible.
+        if let Some(ty) = tcx.types.anon_canonical_bound_tys.get(var.as_usize()).copied() {
+            ty
+        } else {
+            Ty::new(
+                tcx,
+                Bound(
+                    ty::BoundVarIndexKind::Canonical,
+                    ty::BoundTy { var, kind: ty::BoundTyKind::Anon },
+                ),
+            )
         }
     }
 
@@ -952,6 +968,10 @@ impl<'tcx> rustc_type_ir::inherent::Ty<TyCtxt<'tcx>> for Ty<'tcx> {
         Ty::new_bound(tcx, debruijn, ty::BoundTy { var, kind: ty::BoundTyKind::Anon })
     }
 
+    fn new_canonical_bound(tcx: TyCtxt<'tcx>, var: ty::BoundVar) -> Self {
+        Ty::new_canonical_bound(tcx, var)
+    }
+
     fn new_alias(
         interner: TyCtxt<'tcx>,
         kind: ty::AliasTyKind,