Computation Expressions question

Program.fs

// Learn more about F# at http://fsharp.org
// See the 'F# Tutorial' project for more help.
open System

let toInt a =
    match (Int32.TryParse(a)) with
    | (true, x) -> Some x
    | (false, _) -> None

type MaybeBuilder() =

    member this.Bind(x, f) = 
        printfn "x: %A, f: %A" x f
        match x with
        | None -> None
        | Some a -> f a

    member this.Return(x) = 
        Some x
   
let maybe = new MaybeBuilder()

[<EntryPoint>]
let main argv = 
    printfn "%A" argv

    let parsed =
        maybe {
            let! head = Array.tryHead argv
            let! v = head |> toInt
            return v
        }

    printfn "parsed is %A" parsed

    0 // return an integer exit code

@nojaf correct!