Re: How to find when a function/var has been added

[David Kastrup]

Przemysław Wojnowski <address@hidden> writes:

> 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?

customize-changed is an alias for ‘customize-changed-options’.

(customize-changed &optional SINCE-VERSION)

Customize all settings whose meanings have changed in Emacs itself.
This includes new user options and faces, and new customization
groups, as well as older options and faces whose meanings or
default values have changed since the previous major Emacs
release.

With argument SINCE-VERSION (a string), customize all settings
that were added or redefined since that version.

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-- 
David Kastrup