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From: Andreas Politz <politza@fh-trier.de>
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Subject: Re: going back in time
Date: Mon, 26 Jul 2010 20:49:15 +0200
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Andrea Crotti <andrea.crotti.0@gmail.com> writes:

> I was just wondering if there could be kind of undo operation for higher
> level problems.
>
> For example now I just installed ruby-tests.el from emacswiki, which (I
> saw too late) unfortunately has some "global-set-keys" with combinations
> that normally I use for other things.
>
> Is there any way to revert back to the last global state (it might be
> useful also in other cases of cours)?
> Thanks

Making a deep copy of the obarray at some defined points in time may be
all that it needs.

-ap