fn test_fn() -> i32 {
    42
}

fn main() {
    let a = [0u8; 32];
    let funcs: &[&Fn() -> i32] = &[
        &test_fn,
        &|| 42,
        &move || a[0] as i32,
    ];
    for func in funcs {
        println!("{}", std::mem::size_of_val(*func));
    }
}