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bug#21629: 25.0.50; python.el freezes up around docstrings.
From: |
Eli Zaretskii |
Subject: |
bug#21629: 25.0.50; python.el freezes up around docstrings. |
Date: |
Tue, 06 Oct 2015 17:54:00 +0300 |
> From: Jacob MacDonald <jaccarmac@gmail.com>
> Date: Tue, 06 Oct 2015 04:48:50 +0000
>
> Begin from a fresh 'emacs -Q'. Create a Python file. Insert a long
> docstring which contains a header line and then a long body which
> includes a few line breaks and spaces in it. The docstring should look
> something like this:
>
> """test header
>
> lorem ipsum... more text more text more text
> x10 lines
> ...
> ...
> """
>
> Save the file and close emacs. Start a fresh 'emacs -Q'. Open dired in
> the directory which contains the Python file you created. Navigate to
> the file and try to open in from dired. Emacs will freeze indefinitely
> and eat all the system resources it can. You can break the cycle by
> pressing C-q many times, but the freeze happens again on every single
> redisplay. If you wait awhile before cancelling the redisplay, you may
> see that fontification has frozen somewhere in the middle of the docstring.
It infloops in python-nav-end-of-statement. The loop there ends up
one position before EOB, then jumps back to string-start, and so on
and so forth, ad nauseam.
I have no idea what causes this, but I hope Python-mode experts and
perhaps Stefan (due to syntax stuff) will be able to figure this out.