{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"self.typeck_results.borrow_mut().user_provided_sigs.insert(expr_def_id,"}]}
        self.typeck_results.borrow_mut().user_provided_sigs.insert(expr_def_id, c_result);
        let c_result = self.infcx.canonicalize_response(result);