tests/ui/numbers-arithmetic/overflow-attribute-works-2.rs

//@ run-pass
//@ compile-flags: -C overflow_checks=false

#![feature(cfg_overflow_checks)]

fn main() {
    assert!(!cfg!(overflow_checks));
    assert!(!compiles_differently());
}

#[cfg(overflow_checks)]
fn compiles_differently()->bool {
    true
}

#[cfg(not(overflow_checks))]
fn compiles_differently()->bool {
    false
}