exit:frame-exiting

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`exit:frame-exiting`

This is a parameter whose value is used as the parent of the "Are you sure you want to exit" dialog.

(exit:frame-exiting frame) -> void
frame : (union #f (instance frame%) (instance dialog%)
sets the value of the parameter to frame.
(exit:frame-exiting) -> (union #f (instance frame%) (instance dialog%)
returns the current value of the parameter.