ecerr_destination_encoding 4121 transcode.c        rb_define_method(rb_eUndefinedConversionError, "destination_encoding", ecerr_destination_encoding, 0);
ecerr_destination_encoding 4127 transcode.c        rb_define_method(rb_eInvalidByteSequenceError, "destination_encoding", ecerr_destination_encoding, 0);