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How to find when a function/var has been added

From: Przemysław Wojnowski
Subject: How to find when a function/var has been added
Date: Wed, 05 Aug 2015 20:38:44 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0

Hello everybody,

What is the fastest way to find out since when a function/var is available in Emacs? Only through NEWS?

It's common case when one writes an elisp package and want to preserve compatibility with previous Emacs versions.

In Java it's very common to see in docs on classes/methods/fields "Since: n", where "n" is Java version. Wouldn't such information help in core Emacs libs too? What do you think?


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