ecerr_destination_encoding_name 4561 transcode.c        rb_define_method(rb_eUndefinedConversionError, "destination_encoding_name", ecerr_destination_encoding_name, 0);
ecerr_destination_encoding_name 4567 transcode.c        rb_define_method(rb_eInvalidByteSequenceError, "destination_encoding_name", ecerr_destination_encoding_name, 0);