Ahhh, I see. Well! This patch didn't need to touch either function, so!
Here we are.
Ross Donaldson <gastove@gmail.com> writes:
> I was thrown off by the `prog-FOO` commands because of this message
> in the ChangeLog:
>
> ```
> 2016-03-27 Dmitry Gutov <dgutov@yandex.ru>
>
> Remove prog-indentation-context
>
> * lisp/progmodes/prog-mode.el: (prog-indentation-context)
> (prog-first-column, prog-widen): Remove, as discussed in
> http://lists.gnu.org/archive/html/emacs-devel/2016-03/msg01425.html.
> ```
Oh, that is a bit confusing, but now I see what happened: it was indeed
removed for Emacs-25, but is still present in Emacs-26 and later. If
you look to the end of that message you will see
Do not merge to master.
Which gives the hint.
> I haven't assigned copyright to Emacs yet; I'd be happy to, and also,
> I suspect this patch will be quite short. I'll send it over soon.
Thanks!