#[derive(Clone, Copy)]
struct E {
    field1: u32,
    field2: u32,
}

fn do_something(E { field1, field2}: E) -> u32 {
    field1 + field2
}

fn main() {
    let e = E { field1: 1, field2: 2};
    let f = |E { field1, field2}| field1 + field2;
    println!("{:?}", f(e));
    println!("{:?}", do_something(e));
}