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accept-process-output throws

From: JD Smith
Subject: accept-process-output throws
Date: Tue, 23 Nov 2021 15:36:38 -0500

I find that, in a loop like:

    (while waiting-for-output
      (accept-process-output process))
  (if waiting-for-output
      (warn "accept-process-output exited non-locally!")))

i.e. waiting for an async process (iPython), accept-process-output (emacs 27.2) sometimes exits non-locally. I checked for any signals that might cause this (none), and then I suspected re-entering a-p-e could throw, so guarded against that, but still no luck.  

Does anyone know any other reasons that accept-process-output would (occasionally) exit non-locally?  Is this expected?

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