GNU bug report logs - #6154
error from: describe-face font-lock-*

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From: Dan Nicolaescu <dann <at> gnu.org>
To: David Reitter <david.reitter <at> gmail.com>
Cc: Stefan Monnier <monnier <at> IRO.UMontreal.CA>, 6154 <at> debbugs.gnu.org, nathaniel.cunningham <at> gmail.com
Subject: bug#6154: error from: describe-face font-lock-*
Date: Mon, 10 May 2010 23:21:07 -0400

David Reitter <david.reitter <at> gmail.com> writes:

> On May 10, 2010, at 11:37 AM, Stefan Monnier wrote:
>
>>> `describe-face' assumes that `find-lisp-object-file-name' always
>>> returns a file name.  I'm seeing the bug described below because we're
>>> pre-loading font-lock and this function returns `C-source'.
>> 
>> All faces are defined in Lisp code, AFAIK, so the value `C-source' is
>> not a correct one.  Without knowing how it happened, it's hard to tell
>> where the problem should be fixed.
>
> Perhaps "pre-loading font-lock" was not enough of a hint in my report.
>
> With a recent Emacs 23 branch checkout:
>
> add a lisp/site-load.el file with the contents
>
> (load "font-lock")

Why would you do that?  font-lock is loadup.el.

> then re-build.
>
> Then, Emacs -Q, and
>
> M-x describe-face RET font-lock-comment-face RET
>
> will produce the error.  Trace, again, below.
>
>
> So:
>
> The `find-lisp-object-file-name' should probably return "font-lock.el" instead of `C-source'.
>
> `describe-face' will break as it is should a face ever be defined in C.  See patch.
>
>
>
>
> Debugger entered--Lisp error: (wrong-type-argument stringp C-source)
>   file-name-nondirectory(C-source)
>   describe-face((font-lock-comment-face))
>   call-interactively(describe-face t nil)
>   execute-extended-command(nil)
>   call-interactively(execute-extended-command nil nil)

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