Stefan Kangas <stefankangas@gmail.com> writes:

 > When I evaluate this in emacs -Q:
 >
 >     (progn (require 'message)
 >            (customize-option 'message-server-alist))
 >
 > It fails with this backtrace:
 >
 > Debugger entered--Lisp error: (void-function nil)
 >   nil((quote :args ((choice (string :tag "From Address") (function
 > :tag "Predicate")))))

When wid-edit tries to create a widget of type "quote", it usually
indicates double quoting in the :type definition.

The attached patch should fix it, please confirm.