fun foo (xs: int): int = return xs + 1;
fun bar (xs: int) (x: int): int = return xs - x;

fun main: int = do
    let res: int = foo(69)
                   |> bar(1);
    @write(res);

    @write("\n");

    let y: int = 68
                 |> foo();
    @write(y);
end;