Split out IntoIterator and non-Iterator constructors for AliasTy/AliasTerm/TraitRef/projection

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

@@ -940,7 +940,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             let ty = traits::normalize_projection_ty(
                 self,
                 param_env,
-                ty::AliasTy::new(tcx, tcx.lang_items().deref_target()?, trait_ref.args),
+                ty::AliasTy::new_from_args(tcx, tcx.lang_items().deref_target()?, trait_ref.args),
                 cause.clone(),
                 0,
                 // We're *intentionally* throwing these away,

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

@@ -2487,7 +2487,7 @@ impl<'tcx> SelectionContext<'_, 'tcx> {
                         trait_def_id,
                         &[normalized_ty.into()],
                     );
-                    ty::TraitRef::new(tcx, trait_def_id, err_args)
+                    ty::TraitRef::new_from_args(tcx, trait_def_id, err_args)
                 };
 
                 let obligation = Obligation::new(self.tcx(), cause.clone(), param_env, trait_ref);