IAT: Introduce AliasKind::Inherent

compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs

@@ -498,7 +498,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
                     // this trait and type.
                 }
                 ty::Param(..)
-                | ty::Alias(ty::Projection, ..)
+                | ty::Alias(ty::Projection | ty::Inherent, ..)
                 | ty::Placeholder(..)
                 | ty::Bound(..) => {
                     // In these cases, we don't know what the actual

compiler/rustc_trait_selection/src/traits/select/confirmation.rs

@@ -1268,7 +1268,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
 
                 // If we have a projection type, make sure to normalize it so we replace it
                 // with a fresh infer variable
-                ty::Alias(ty::Projection, ..) => {
+                ty::Alias(ty::Projection | ty::Inherent, ..) => {
                     let predicate = normalize_with_depth_to(
                         self,
                         obligation.param_env,

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -2315,7 +2315,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
             | ty::Dynamic(..)
             | ty::Param(..)
             | ty::Foreign(..)
-            | ty::Alias(ty::Projection, ..)
+            | ty::Alias(ty::Projection | ty::Inherent, ..)
             | ty::Bound(..)
             | ty::Infer(ty::TyVar(_) | ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {
                 bug!("asked to assemble constituent types of unexpected type: {:?}", t);