> Is there any specific reason for not having a Queue.fold 
> function in the standard library?

Your version of fold empties the queue as a side effect, which is
usually not part of the semantics of fold.

That said, there is an implementation of Queue.fold in the CVS version of
O'Caml (along with a slightly more efficient implementation of all Queue
functions).

-- 
François Pottier
Francois.Pottier@inria.fr
http://pauillac.inria.fr/~fpottier/
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