Gerald heinig wrote:
> let intarg = fun i -> Printf.printf "%d"

This function takes an arbitrary value "i", ignores it and then returns

   Printf.printf "%d"

which has type int -> unit, so your intarg has type

   'a -> int -> unit

which is probably not what you wanted (and not wat Arg.Int expects). Try

   let intarg = Printf.printf "%d"

or

   let intarg i = Printf.printf "%d" i

instead (the latter for should optimize better, but if you parse command line 
arguments in an inner loop you should refactor your program anyway).

Yours, Florian.

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