Re: Use (eval-when-compile 'treesit) to save us from writing declare-function forms

[Eli Zaretskii <eliz@gnu.org>]

> From: Yuan Fu <casouri@gmail.com>
> Date: Wed, 4 Dec 2024 22:25:33 -0800
> Cc: emacs-devel@gnu.org
> 
> >> If we use eval-when-compile, we don’t need to write declare-function forms in c-ts-mode.el anymore, because treesit.el has declare-function forms for all treesit.c functions.
> > 
> > That's what I don't understand: how will eval-when-compile which loads
> > treesit.el be different from (require 'treesit) we already have in
> > c-ts-mode?  Don't they both load treesit.el?
> 
> I maybe wrong here, but I thought if you don’t use eval-when-compile, simply byte-compiling c-ts-mode.el wouldn’t load treesit.el?

Yes, it would.  You can clearly see this in a debugger if you put a
breakpoint in Fload and then byte-compile c-ts-mode.el.