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8.1.6 The function-link Widget

Syntax: 

type ::= (function-link [keyword argument]...  function)

A widget to represent a link to an Emacs function. Its super is the link widget.

It overrides the :action property, to a function to describe function.

Example: 

(widget-create 'function-link
               :button-prefix ""
               :button-suffix ""
               :tag "Describe the function that gets called"
               #'widget-function-link-action)