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Re: Why post-command-hook so difficult to debug?

From: Tassilo Horn
Subject: Re: Why post-command-hook so difficult to debug?
Date: Thu, 23 Aug 2012 20:37:57 +0200
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.2.50 (gnu/linux)

Leo <address@hidden> writes:

Hi Leo!

> For example, some days ago I was seeing this error:
> Error in post-command-hook (completion-in-region--postch): 
> (wrong-type-argument characterp 134217855)
> and it turned out the error was generated by another function 100 miles
> from completion-in-region--postch.  debug-on-error is mostly useless in
> this case.

I'm having a very similar error right now, 

  Error in post-command-hook (completion-in-region--postch):
    (wrong-type-argument stringp nil)

I've stared at the definition of `completion-in-region--postch', and
probably the error happens in the the form:

    (funcall completion-in-region-mode--predicate)

Of course, now I can't reproduce it anymore... :-(

Anyway, could you please elaborate what was the 100 miles away function
in your case?  Maybe it's similar here...


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