on a system with no ICU data, use ustdio to do u_fprintf(..., "%V")
it will allocate a RuleBasedNumberFormat(URBNFRuleSetTag tag, const Locale&
alocale, UErrorCode& status) which will fail (not finding the localized spellout
then, ustdio will attempt to unum_clone() the failed RBNF.
unum_clone calls something that calls RBNF::getRules()
getRules() fails because ruleSets is NULL