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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Obtaining a database of new functionality per Emacs version
Date: Mon, 07 Dec 2020 22:25:11 +0200
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Cc: emacs-devel@gnu.org, mail@vasilij.de
To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwv360h8k8g.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Vasilij Schneidermann <mail@vasilij.de>,  emacs-devel@gnu.org
> Date: Mon, 07 Dec 2020 15:08:42 -0500
> 
> Maybe a script that scrapes the `DEFUN`s and `DEFVAR`s from the C code,
> along with the `defun`s and `defvar`s from the Lisp code would be a good
> start.

That's "make TAGS", right?  Or, if you don't want the rest, you can
invoke etags to find only those constructs.