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From: Lennart Borgman <lennart.borgman@gmail.com>
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Subject: Re: Loading souce Elisp faster
Date: Mon, 25 Feb 2013 21:57:01 +0100
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Cc: "Richard M. Stallman" <rms@gnu.org>, Drew Adams <drew.adams@oracle.com>,
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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On Mon, Feb 25, 2013 at 9:53 PM, Stefan Monnier
<monnier@iro.umontreal.ca> wrote:
>> When is compatibility a problem with this choice? (You can of course
>> put a "coding" comment too in the files.)
>
> Older emacsen won't find the .el8 files.

Yes, but when will that be a compatibility problem?