_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE;
# system_error
- _ZSt15system_category;
- _ZSt16generic_category;
+ _ZSt15system_categoryv;
+ _ZSt16generic_categoryv;
_ZNKSt10error_code23default_error_conditionEv;
_ZNKSt14error_category23default_error_conditionEi;
_ZNKSt4hashISt10error_codeEclES0_;
- _ZSt20__throw_system_errorPKc;
_ZSt20__throw_system_errori;
# char16_t and char32_t