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From: Stefan Monnier <monnier@iro.umontreal.ca>
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Subject: Re: About setf extensions
Date: Fri, 15 Feb 2013 09:48:04 -0500
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>      Most of these have directly corresponding "set" functions, like
>      `use-local-map' for `current-local-map', or `goto-char' for
>      `point'.  A few, like `point-min', expand to longer sequences of
>      code when they are used with `setf' (`(narrow-to-region x
>      (point-max))' in this case).

> I don't understand the `point-min' example.  What does the "x" mean
> here?

(setf (point-min) x) gets turned into (narrow-to-region x (point-max)).


        Stefan