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bug#29679: 26.0.90; :after-hook not compiled
From: |
Eli Zaretskii |
Subject: |
bug#29679: 26.0.90; :after-hook not compiled |
Date: |
Fri, 15 Dec 2017 12:34:11 +0200 |
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Tue, 12 Dec 2017 15:07:24 -0500
> Cc: Alan Mackenzie <acm@muc.de>
>
> I just realized that the :after-hook option of define-derived-mode (new
> in Emacs-26) is expanded in a way that introduces some problems.
> More specifically a
>
> :after-hook (foo bar)
>
> gets turned into something like
>
> (push '(foo bar) 'delayed-after-hook-forms)
>
> which means that the code (foo bar) is not byte-compiled, hence is not
> macro-expanded, and will be evaluated later via `eval` without paying
> attention to the setting of `lexical-binding`.
>
> It's not a very serious problem in practice, but if we keep the code as
> we have it, it means that code byte-compiled with Emacs-26 will use the
> above
>
> (push '(foo bar) 'delayed-after-hook-forms)
>
> in its .elc and we'll have to preserve backward compatibility with it.
> So it'd be better to fix it before Emacs-26 is released.
> Here's a minimal patch for it, which I hope is safe enough for emacs-26.
>
> OK to push to emacs-26?
LGTM, thanks. Alan, do you agree?