{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
            let ty = self.table.normalize_associated_types_in(ty);
            let ty = self.table.insert_type_vars(ty);
            self.resolve_ty_assoc_item(ty, last.name, id).map(|(it, substs)| (it, Some(substs)))?