Hi!

> I had a file open in Emacs that was rewritten over and over again by
> an external process. My guess is that Emacs decides that it should be
> reverted, but when it actually reads the file, it is no longer
> present.

I've tried to write a test case for this, but I've failed. Do you have a
recipe to provoke this error?

Unfortunately, no. And I don't see how it would be possible to write a test for this either, as the file must be removed after auto-revert decides that it should be reverted and before the actual revert takes place.

In real-life, I see it a couple of times each week. However, in my Emacs I have opened files associated with processes that erase and rewrite them, say, every ten seconds.

Anders