rb_econv_asciicompat_encoding  259 include/ruby/encoding.h const char *rb_econv_asciicompat_encoding(const char *encname);
rb_econv_asciicompat_encoding  731 io.c                       senc = rb_econv_asciicompat_encoding(rb_enc_name(enc));
rb_econv_asciicompat_encoding 2720 transcode.c        result_name = rb_econv_asciicompat_encoding(arg_name);