AliasTy::new instead of tcx method

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -3937,7 +3937,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
             // This corresponds to `<ExprTy as Iterator>::Item = _`.
             let projection = ty::Binder::dummy(ty::PredicateKind::Clause(
                 ty::ClauseKind::Projection(ty::ProjectionPredicate {
-                    projection_ty: self.tcx.mk_alias_ty(proj.def_id, args),
+                    projection_ty: ty::AliasTy::new(self.tcx, proj.def_id, args),
                     term: ty_var.into(),
                 }),
             ));

compiler/rustc_trait_selection/src/traits/project.rs

@@ -2072,7 +2072,7 @@ fn confirm_generator_candidate<'cx, 'tcx>(
         };
 
         ty::ProjectionPredicate {
-            projection_ty: tcx.mk_alias_ty(obligation.predicate.def_id, trait_ref.args),
+            projection_ty: ty::AliasTy::new(tcx, obligation.predicate.def_id, trait_ref.args),
             term: ty.into(),
         }
     });
@@ -2116,7 +2116,7 @@ fn confirm_future_candidate<'cx, 'tcx>(
         debug_assert_eq!(tcx.associated_item(obligation.predicate.def_id).name, sym::Output);
 
         ty::ProjectionPredicate {
-            projection_ty: tcx.mk_alias_ty(obligation.predicate.def_id, trait_ref.args),
+            projection_ty: ty::AliasTy::new(tcx, obligation.predicate.def_id, trait_ref.args),
             term: return_ty.into(),
         }
     });
@@ -2172,7 +2172,7 @@ fn confirm_builtin_candidate<'cx, 'tcx>(
     };
 
     let predicate =
-        ty::ProjectionPredicate { projection_ty: tcx.mk_alias_ty(item_def_id, args), term };
+        ty::ProjectionPredicate { projection_ty: ty::AliasTy::new(tcx, item_def_id, args), term };
 
     confirm_param_env_candidate(selcx, obligation, ty::Binder::dummy(predicate), false)
         .with_addl_obligations(obligations)
@@ -2245,7 +2245,7 @@ fn confirm_callable_candidate<'cx, 'tcx>(
         flag,
     )
     .map_bound(|(trait_ref, ret_type)| ty::ProjectionPredicate {
-        projection_ty: tcx.mk_alias_ty(fn_once_output_def_id, trait_ref.args),
+        projection_ty: ty::AliasTy::new(tcx, fn_once_output_def_id, trait_ref.args),
         term: ret_type.into(),
     });
 

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

@@ -704,7 +704,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             let ty = traits::normalize_projection_type(
                 self,
                 param_env,
-                tcx.mk_alias_ty(tcx.lang_items().deref_target()?, trait_ref.args),
+                ty::AliasTy::new(tcx, tcx.lang_items().deref_target()?, trait_ref.args),
                 cause.clone(),
                 0,
                 // We're *intentionally* throwing these away,