Hello,
How do I constrain the type of method parameters without creating a tuple? I am trying

let eventListener (s:obj, e:ExecDetailsEventArgs) = ignore( printfn "in event %A" e.CustomArgData)
let elh = new System.EventHandler<ExecDetailsEventArgs>(eventListener)

But then visual studio complains eventListener has the type (obj*ExecDetailsEventArgs)->unit instead of
obj -> ExecDetailsEventArgs -> unit, for the 2nd line. This is because eventListener's args are interpreted as a tuple.

If I try
let eventListener s:obj e:ExecDetailsEventArgs = ignore( printfn "in event %A" e.CustomArgData))
I get an error on e: -- syntax error in labelled type argument -- because it thinks the :obj defined the return type of the method, and e:... is bad syntax.

and
let eventListener s e:ExecDetailsEventArgs = ignore( printfn "in event %A" e.CustomArgData))
fails because it thinks ExecDetailsEventArgs is trying to specify the returntype of eventListener instead of the parameter type.

So how can I annotate type on let eventListener s e:CustomEventArg = ... without creating a tuple?
Alternatively, if I avoid "s" and say let eventListener (e:CustomEventArg) = ..., then the EventHandler complains about the invalid type of the receiver. How can I intantiate the SystemEventHandler with a customEventArg type? Thank you, PD