#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let mut a = 0;
    let mut function_with_side_effects = || {
        a += 1;
    };
    true.then_some(function_with_side_effects());
    false.then_some(function_with_side_effects());
    assert_eq!(a, 2);
}