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Why post-command-hook so difficult to debug?

From: Leo
Subject: Why post-command-hook so difficult to debug?
Date: Sun, 22 Jul 2012 10:40:20 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (Mac OS X 10.6.8)

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.

Can post-command-hook errors be more informative? Thanks.


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