rustv0_parse_disambiguator
if (!OPTIONAL(st, rustv0_parse_disambiguator(st, sv, &disamb)))
return (OPTIONAL(st, rustv0_parse_disambiguator(st, sv, &val)) &&
if (!OPTIONAL(st, rustv0_parse_disambiguator(st, sv, &disambiguator)))
static boolean_t rustv0_parse_disambiguator(rust_state_t *restrict,