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bug#14207: 24.2; insert-file-contents clobbers match data


From: Aidan Gauland
Subject: bug#14207: 24.2; insert-file-contents clobbers match data
Date: Tue, 16 Apr 2013 13:22:12 +1200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> From: Aidan Gauland <address@hidden>
>> Date: Mon, 15 Apr 2013 12:56:26 +1200
>> 
>> If (and only if) the match data is non-nil when `insert-file-contents'
>> is called, it clobbers the match-data.
>
> And why is that a bug?
>
> From the ELisp manual (node "Match Data"):
>
>      Notice that all functions are allowed to overwrite the match data
>   unless they're explicitly documented not to do so.
>
> 'insert-file-contents' is not documented to preserve match data.

Oh, OK.  I thought it was the other way around: functions are supposed
to explicitly be documented as modifying the match data.





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