When point is on the ' of a 'foo quoted variable, M-x describe-variable
doesn't offer that variable as a default, and `variable-at-point'
doesn't return it.  Eg.

    (set 'baud-rate 9600)
         ^---point here
    M-: (variable-at-point)
    => 0

where I hoped it would return `baud-rate', as it does if point is on say
the "b".

I strike this when using backward/forward sexp to move between args
since that leaves point on the '.  It'd be good if variable-at-point
allowed/recognised that.

In the code there's a

    (skip-chars-forward "'")

which looks like it's supposed to do this, but it's after the bit going
to the start of the word and seems to be defeated by (forward-sexp -1).
Actually that ends up going to the previous sexp, so if you've got

    (list 'emacs-version
             'baud-rate)
             ^---point here

then it returns the preceding `emacs-version' instead of `baud-rate'.

Perhaps the change below.  bzr has still defeated me, or I would try a
diff with it :-(

2011-03-14  Kevin Ryde  <user42@zip.com.au>

	* help-fns.el (variable-at-point): Skip forward across ' first, to
	allow point on the ' part of quoted 'emacs-version etc.  Helps
	when moving by sexps which leaves point on the ' instead of the
	variable name as such.