goto error;
if (isl_stream_next_token_is(s, ISL_TOKEN_EXISTS) ||
+ isl_stream_next_token_is(s, ISL_TOKEN_NOT) ||
isl_stream_next_token_is(s, ISL_TOKEN_TRUE) ||
isl_stream_next_token_is(s, ISL_TOKEN_FALSE) ||
isl_stream_next_token_is(s, ISL_TOKEN_MAP)) {