Make format-spec accept a function as the substitution

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Make format-spec accept a function as the substitution

From:	Stefan Kangas
Subject:	Make format-spec accept a function as the substitution
Date:	Tue, 27 Sep 2022 14:02:32 -0400

Eli Zaretskii <eliz@gnu.org> writes:

> And then I'd suggest something like
>
>   If the substitution for a specification character is a function, the
>   function will be called only if FORMAT uses that character.

Thanks.  Please find attached a complete patch with documentation.

0001-Make-format-spec-support-functions.patch
Description: Text Data

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