OnigCaseFoldCodeItem  163 include/ruby/oniguruma.h   int    (*get_case_fold_codes_by_str)(OnigCaseFoldType flag, const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem acs[], struct OnigEncodingTypeST* enc);
OnigCaseFoldCodeItem 3373 regcomp.c        OnigCaseFoldCodeItem items[ONIGENC_GET_CASE_FOLD_CODES_MAX_NUM];
OnigCaseFoldCodeItem 4362 regcomp.c        OnigCaseFoldCodeItem items[ONIGENC_GET_CASE_FOLD_CODES_MAX_NUM];