#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(array_into_iter_constructors)]
use std::array::IntoIter;
pub fn get_bytes(b: bool) -> IntoIter<i8, 4> {
    if b { [1, 2, 3, 4].into_iter() } else { IntoIter::empty() }
}
fn main() {
    assert_eq!(get_bytes(true).collect::< Vec < _ >> (), vec![1, 2, 3, 4]);
    assert_eq!(get_bytes(false).collect::< Vec < _ >> (), vec![]);
}