Re: X-coding-system incompatibility, and workaround

[Richard Stallman <rms@gnu.org>]

    When I create an rmail file using emacs 22.1.1, then read the
    file using emacs 21.3.1 (on another system), it generally works, but
    occasionally I'll run into a message causes a problem.

Can you provide a copy of a file that causes this problem?
(Please uuencode it before you send it.)

Can you post a *precise* test case for this bug?  The test case should
start with `emacs -q', so that your .emacs file does not affect it,
and it should show exactly what text to put in the buffer, what
commands to execute, so as to produce such a file.

    Could you modify future versions of emacs to try to avoid using
    coding systems that are not defined on earlier versions?

I don't know if this is possible.  To think about the question
we would need to figure out WHY it uses those coding systems.
That's why we need a test case, etc.

Please read the Bugs section in the Emacs manual, which provides
guidelines on how to write a bug report to give us the
necessary information so we can fix the bug.