bug#63896: [PATCH] Support annotating and sorting the project list during completion

[Eli Zaretskii <eliz@gnu.org>]

> From: Spencer Baugh <sbaugh@janestreet.com>
> Cc: 63896@debbugs.gnu.org
> Date: Tue, 27 Jun 2023 16:30:38 -0400
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> +(defvar compilation-exit-status nil
> +  "The `process-exit-status' of the compilation process, or nil if not exited yet.")

This should clarify that this is the exit status of the _last_
compilation in this buffer.  It should also say that the variable is
always buffer-local.  I'd also add a reference to
compilation-process-status, because the value of nil is not
informative enough unless one looks at that other variable.

> +(defvar compilation-process-status nil
> +  "The latest `process-status' of the compilation process.")

Likewise here, about the buffer-local part.

I think these variables warrant to be called out in NEWS.