adaptive-fill-regexp grows too big

[Chris Van Dusen]

I was getting an error that adaptive-fill-regexp was too big, and was able to trace it (with trace-function) to c-setup-paragraph-variables in cc-styles.el when moving through a file with mixed PHP, HTML, and Javascript.

This was verified by looking at adaptive-fill-regexp via C-h v adaptive-fill-regexp RET, moving around in a PHP file as described above, and then looking at the value again.

[lborgman (lennart-borgman)]

Thanks Chris,

I really wonder what is happening here. I can't reproduce this. I looked at the code and I can't see how it can happen. Perhaps somehow adaptive-fill-regexp gets wrong default value, but

Some things I wonder:

1) Exactly what version of Emacs are you using?

2) Is adaptive-fill-regexp buffer local?

3) Can you please give me a recipe how to reproduce this starting from

  M-x emacs-Q-nxhtml

[Chris Van Dusen (chris0123456789)]

Hi, Lennart,

Thanks for the prompt reply.

1) GNU Emacs 24.0.50.4 (x86_64-apple-darwin10.3.0, NS apple-appkit-1038.29) of 2010-04-28 on profex.local

2) Yes.

3) I should have been more specific in my initial description.

It's only happened a few times, and usually takes a few hours to happen. What usually happens is that I'll be coding, and have erc open. After some hours, I'll start getting a Backtrace buffer with an error saying that adaptive-fill-regexp is too big, with the error originating from erc.

Originally, I thought that erc was the source of the problem, but could find nothing suspicious. Since nxhtml was the only other major mode that I had in fairly heavy use, I decided to look there.

I grep'ed through the files in my elisp directory for instances of adaptive-fill-regexp to see if something there was modifying it. I saw the couple of references to it in nxhtml, but couldn't see how they would change the value. I then looked through the lisp directory and saw a few references, but most were to things that I don't currently use (e.g., gnus, org). Also listed were cc-mode.el, cc-vars.el and cc-styles.el. Of these, cc-styles.el contains c-setup-paragraph-variables which does modify adaptive-fill-regexp.

I traced the function and whenever it was called, I checked the value of fill-adaptive-regexp. It was increasing each time.

I've attached the value of adaptive-fill-regexp after doing some navigating in a couple of files after running emacs-Q-nxhtml.

[lborgman (lennart-borgman)]

Is the description in 3 after starting a new emacs the way I proposed, ie with

  M-x emacs-Q-nxhtml

[Chris Van Dusen (chris0123456789)]

Yes.

[lborgman (lennart-borgman)]

This is an Emacs bug. It is a problem with js.el.

I have filed a bug report:

  http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6071

[Chris Van Dusen (chris0123456789)]

Thanks for your help with this.

[lborgman (lennart-borgman)]

Hi Chris,

Without your report we would probably not had catch this in the next Emacs release. Chong has added a fix for the release branch now so I am marking this as invalid. (At the moment it is not fixed on "trunk", but it will surely be shortly.)

I am marking this as invalid here, since it is not a bug in nXhtml. (Shouldn't there be something like "bug elsewhere"?)