{"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"throw_ub!(AbiMismatchReturn"}]}
                throw_ub!(AbiMismatchReturn {
            if !self.check_argument_compat(&caller_fn_abi.ret, &callee_fn_abi.ret)? {
                    caller_ty: caller_fn_abi.ret.layout.ty,