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Lets say I have a function
let makeMonitoredFun f =
let c = ref 0
(fun x -> c := !c+1; printf "Called %d times.\n" !c; f x);;
Why I am not allowed to do this.
let mrev = makeMonitoredFun List.rev
So presumably you are referring to the value type restriction you get when you try to compile the code. If you add a type annotation it will work fine/. For the details of value type errors see this article http://blogs.msdn.com/b/mulambda/archive/2010/05/01/value-restriction-in-f.aspx from one of the F# developers