[racket] Using _fun for callbacks

Yesterday, Matthew Flatt wrote:
> I've run into this, too, and I don't have a better solution right now.
> 
> It's not clear to me what happens with fancy argument specifications
> when the function description is used for a callback, but I've never
> gotten around to sorting it out.

Sounds like what I was talking about here:

  http://lists.racket-lang.org/dev/archive/2012-March/009208.html

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          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                    http://barzilay.org/                   Maze is Life!