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How check when symbol is introduced in Emacs?


From: Oleksandr Gavenko
Subject: How check when symbol is introduced in Emacs?
Date: Wed, 19 Jan 2011 12:23:59 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7

Usually I get Error with previous Emacs version when symbol is undefined.

To workaround I use code like:

(when (or (>= emacs-major-version 23)
(and (= emacs-major-version 22) (>= emacs-minor-version 2)))
   (setq 'symb val)
  )

But I must know low limit of version to get better code.

Previously I put version when Emacs don;t fail.

Next I learn to search ChangeLog.

Next I learn use bzr repo with C-x v g and pressing a lot of 'A' command but
it to hard understand which revision goes to release.

Some symbol have properties like :version "20.4". I use it.

Please recommend another simple way or point to docs!




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