No argument names in abstract declaration?

Question

This is the typical declaration of an abstract member in F#:

abstract member createEmployee : string -> string -> Employee

You define the

Answer 1

The syntax for this is super fiddly IMO. I wanted to do this with the parameters as a tuple (like a C# method) and only through trial and error did I find this to work:

    abstract member PutChar : x:int * y:int * c:char * flag:Background -> unit

And this uglier variant also works:

    abstract member PutChar : x : int * y : int * c : char * flag : Background -> unit

Below are things that all felt reasonable but failed with the same error - Unexpected symbol ':' in member definition.:

    // ALL BAD vvv
    abstract member PutChar : (x:int * y:int * c:char * flag:Background) -> unit
    abstract member PutChar : (x:int, y:int, c:char, flag:Background) -> unit
    abstract member PutChar : (x:int) * (y:int) * (c:char) * (flag:Background) -> unit
    // ALL BAD ^^^

Answer 2

What about:

abstract member createEmployee : firstName:string -> lastName:string -> Employee

?