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bug#7127: 23.2; M-x help throws an error

From: Ken Brown
Subject: bug#7127: 23.2; M-x help throws an error
Date: Wed, 29 Sep 2010 09:02:41 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100825 Thunderbird/3.1.3

On 9/29/2010 3:58 AM, Glenn Morris wrote:

This may be Cygwin-specific?

Aidan Kehoe wrote:

(symbol-function 'help-for-help-internal) (h-f-h-i being what help
eventually resolves to) gives me a compiled function with a nil
documentation slot; help.elc has (defalias 'help-for-help-internal
...) with a compiled function and what seems to be the correct lazy
doc reference. The DOC file seems correct, with an entry
Fhelp-for-help-internal Help command.

But (documentation #'custom-declare-variable-early) and (documentation
#'when) both give nil for me, and the same seems to be true for all the
dumped compiled functions with docstrings. I don’t know why that is, and I
don’t especially care to debug it right now, but this binary is what Cygwin
installed, I’m certain I’m not the only one affected.

  >  >  In GNU Emacs 23.2.1 (i686-pc-cygwin, GTK+ Version 2.18.6)
  >  >   of 2010-05-08 on laptop

I can reproduce the problem on my (Cygwin) system. The bug occurs in Emacs 23.2 as well as a build from the current emacs-23 branch. But the bug is gone in a build from the trunk. I wonder if the patch in bug#6715 is what fixed it. At a glance, I don't see anything else Cygwin-specific that might be relevant. When I get a chance, I'll see if back-porting that patch to emacs-23 fixes the problem.


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