F# async workflow early return

EarlyReturn.fs

// No early return
// Prints "gotcha"
async {
    return ()
    printfn "gotcha"
}
|> Async.RunSynchronously

// Early return
// Does not print anything
type ReturnException() =
    inherit exn()
async {
    try
        raise (new ReturnException())
        printfn "gotcha"
    with 
        | :? ReturnException -> ()
}
|> Async.RunSynchronously