#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let f = 3.5_f32;
    assert_eq!(f.copysign(0.42), 3.5_f32);
    assert_eq!(f.copysign(- 0.42), - 3.5_f32);
    assert_eq!((- f).copysign(0.42), 3.5_f32);
    assert_eq!((- f).copysign(- 0.42), - 3.5_f32);
    assert!(f32::NAN.copysign(1.0).is_nan());
}