rb_enc_vsprintf  2053 error.c            mesg = rb_enc_vsprintf(enc, fmt, args);
rb_enc_vsprintf  2088 error.c            mesg = rb_enc_vsprintf(rb_locale_encoding(), fmt, args);
rb_enc_vsprintf  2100 error.c            mesg = rb_enc_vsprintf(rb_locale_encoding(), fmt, args);
rb_enc_vsprintf   136 include/ruby/encoding.h VALUE rb_enc_vsprintf(rb_encoding *, const char*, va_list);
rb_enc_vsprintf  1430 sprintf.c          result = rb_enc_vsprintf(enc, format, ap);
rb_enc_vsprintf  1439 sprintf.c          return rb_enc_vsprintf(NULL, fmt, ap);