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(widget)menu-choice

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The `menu-choice' Widget
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   Syntax:

     TYPE ::= (menu-choice [KEYWORD ARGUMENT]... TYPE ... )

   The TYPE argument represents each possible choice.  The widget's
value will be that of the chosen TYPE argument.  This widget will match
any value matching at least one of the specified TYPE arguments.

`:void'
     Widget type used as a fallback when the value does not match any
     of the specified TYPE arguments.

`:case-fold'
     Set this to nil if you don't want to ignore case when prompting
     for a choice through the minibuffer.

`:children'
     A list whose `car' is the widget representing the currently chosen
     type in the buffer.

`:choice'
     The current chosen type.

`:args'
     The list of types.