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bug#44858: [PATCH] Make byte-compiler warn about wide docstrings

From: Lars Ingebrigtsen
Subject: bug#44858: [PATCH] Make byte-compiler warn about wide docstrings
Date: Fri, 27 Nov 2020 09:37:11 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Eli Zaretskii <eliz@gnu.org> writes:

>> For `substitute-command-keys', it would be nice to get it to work, but I
>> don't think we can know the values of keymaps at compile-time.  Possibly
>> there is a good solution for this, but I couldn't find it.
> How about some simplified heuristics, like assume that the expansion
> takes no more than N characters (where N could be something like 5)?
> This should work in, like, 80% of cases, I think.

Yup.  And 15% is mostly when it expands to `M-x some-long-command'
because the keymap hasn't been loaded yet, I think?  Which we could
conceivably fix by loading the file when the used `C-h f's an autoloaded
function with one of these constructs?  Perhaps a bit hacky...

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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