rb_econv_encoding_to_insert_output  246 include/ruby/encoding.h const char *rb_econv_encoding_to_insert_output(rb_econv_t *ec);
rb_econv_encoding_to_insert_output 1525 transcode.c        const char *insert_encoding = rb_econv_encoding_to_insert_output(ec);
rb_econv_encoding_to_insert_output 2067 transcode.c        ins_enc = rb_econv_encoding_to_insert_output(ec);
rb_econv_encoding_to_insert_output 2096 transcode.c        encname2 = rb_econv_encoding_to_insert_output(ec);
rb_econv_encoding_to_insert_output 3731 transcode.c        insert_enc = rb_econv_encoding_to_insert_output(ec);