Handle TyAlias in projected_ty

Author: alibektas

crates/hir-ty/src/mir.rs

@@ -151,6 +151,7 @@ impl<V, T> ProjectionElem<V, T> {
                 TyKind::Adt(_, subst) => {
                     db.field_types(f.parent)[f.local_id].clone().substitute(Interner, subst)
                 }
+                TyKind::Alias(al) => al.clone().intern(Interner),
                 _ => {
                     never!("Only adt has field");
                     return TyKind::Error.intern(Interner);
@@ -167,6 +168,7 @@ impl<V, T> ProjectionElem<V, T> {
                         TyKind::Error.intern(Interner)
                     }),
                 TyKind::Closure(id, subst) => closure_field(*id, subst, *f),
+                TyKind::Alias(al) => al.clone().intern(Interner),
                 _ => {
                     never!("Only tuple or closure has tuple or closure field");
                     return TyKind::Error.intern(Interner);