rb_to_encoding_index  870 encoding.c         args[0] = (VALUE)rb_to_encoding_index(self);
rb_to_encoding_index 7367 ext/tk/tcltklib.c       rb_enc_associate_index(str, rb_to_encoding_index(encobj));
rb_to_encoding_index   77 include/ruby/encoding.h int rb_to_encoding_index(VALUE);
rb_to_encoding_index 2397 transcode.c        if ((encidx = rb_to_encoding_index(encval = *arg)) < 0) {
rb_to_encoding_index 2760 transcode.c        sidx = rb_to_encoding_index(*snamev_p);
rb_to_encoding_index 2769 transcode.c        didx = rb_to_encoding_index(*dnamev_p);