{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"self.check_lhs_assignable(lhs,"}]}
        self.check_lhs_assignable(lhs, E0070, span, |err| {
            if let Some(rhs_ty) = self.typeck_results.borrow().expr_ty_opt(rhs) {