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variable-link WidgetSyntax:
type ::= (variable-link [keyword argument]... var)
A widget to represent a link to an Emacs variable. Its super is the
link widget.
It overrides the :action property, to a function to describe
var.
Example:
(widget-create 'variable-link :button-prefix "" :button-suffix "" :tag "What setting controls button-prefix?" 'widget-button-prefix)