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bug#8108: 24.0.50; debugging pre-write-conversion in define-coding-syste

From: Werner LEMBERG
Subject: bug#8108: 24.0.50; debugging pre-write-conversion in define-coding-system
Date: Sat, 10 Dec 2016 18:44:24 +0100 (CET)

>> I'm updating my cjk-enc.el package (part of the CJK bundle for
>> LaTeX) to replace make-coding-system with define-coding-system.
>> However, I can't debug it.
> Not sure which version this corresponds to, but in [1]
> encode_coding_object started using safe_call instead of a plain call
> to run the pre-write-conversion function.  safe_call intentionally
> disables the debugger while running the function:
>       /* Use Qt to ensure debugger does not run,
>          so there is no possibility of wanting to redisplay.  */
>       val = internal_condition_case_n (Ffuncall, nargs, args, Qt,
>                                        safe_eval_handler);
> [1]: Tue Mar 29 00:34:38 2005
> http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=d4850d674381d9493c94d30f8944a765e79537eb
> (decode_coding_object): Use safe_call1 instead of call1.
> (encode_coding_object): Use safe_call instead of call2.

Thanks for checking.  Ken'ichi, can you shed some light why you
changed this?  How shall I proceed?


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