{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
                let parent_ty = self.tcx.type_of(parent).instantiate_identity();
                let parent = self.tcx.parent(def_id);
                if let DefKind::TyAlias | DefKind::AssocTy = self.tcx.def_kind(parent)