use std::cell::Cell;

#[derive(Copy, Clone, Debug)]
enum Pin {

    P1,
    P2,
    P3
}

struct SharedPins {

    p1: Pin,
    p2: Pin
}







fn main() {

    let spc = Cell::new(None);
    let conf = setup(&spc);
    println!("{:?}", conf);
}

fn setup(spc: &Cell<Option <SharedPins>>) -> (&Pin, &Pin, Pin) {

    spc.set(Some(SharedPins{p1: Pin::P1, p2: Pin::P2}));




    let sp = unsafe {&*(spc.as_ptr() as *mut SharedPins)};

    (&sp.p1, &sp.p2, Pin::P3)
}