struct Cont<'a, T>{
    field: Option<&'a T>
}

static CONT: Cont<'static, Vec<u8>>=Cont{field:None};

fn get<'a, 'b, T>(_: &'b Cont<'a, T>, field: &'a T)->&'b T{
    field
}

fn extend<'a>(x:&'a Vec<u8>) -> &'static Vec<u8>{
    let f:fn(_, field:&'a Vec<u8>)-> &'static Vec<u8> = get;
    f(&CONT, x)
}

fn main(){
    let v = vec![255;1000000];
    let r: &'static Vec<u8> = extend(&v);
    drop(v);
    dbg!(r.last());
}