On Sun, 2009-07-05 at 22:30 +0200, Henning Thielemann wrote:
> 
> (?) is also undefined in Prelude.

Which i think is a good thing. 
I think it's quite nice to use (?) as an operator in higher order
functions. 
Eg. 
foldr _ z []     =  z
foldr (?) z (x:xs) =  x ? foldr (?) z xs

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