bug#16271: warn about quoted const's in defcustom

[Lars Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

> The argument of a `const' (or `other') inside a defcustom type should
> (almost always) not be quoted. Yet people keep doing it.
> It would be nice if there was some way to warn about this.

Yes, that would be nice, so I've now implemented it.  However, there's
one false positive:

(defcustom erc-button-alist
  '(('nicknames 0 erc-button-buttonize-nicks erc-nick-popup 0)

[...]

                (choice :tag "Matches"
                        regexp
                        (variable :tag "Variable containing regexp")
                        ;; FIXME It really does mean 'nicknames
                        ;; rather than just nicknames.
                        (const :tag "Nicknames" 'nicknames))

And this really means 'nicknames.  Anybody got any suggestions how to
work around that?

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   bloggy blog: http://lars.ingebrigtsen.no