Fsharp: Function's Type

actually you cannot show function's type at runtime.

let fadd x = x + 1
printfn "%i" (fadd 3)
// 4

printfn "%O" ((fadd).GetType())
// FSI_0001+it@5

you can show it in the interactive command line the dotnet fsi, by just typing the function's name. e.g.

let add x y = x + y;;
add;;

FSI will immediately show something like:

val add : x:int -> y:int -> int