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From: Richard Stallman <rms@gnu.org>
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Subject: Re: last try
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    I'm willing to do whatever seems to be useful.  Can anyone tell me
    what Tramp should do regarding nonlocal exits?

Generally speaking, it should use unwind-protect to clean up the
state so as to make the state regular again.

Precisely when and how that should be done is something only a person
familiar with the details of Tramp can say.