Function std::f64::copysign
pub fn copysign(x: f64, y: f64) -> f64
pub fn copysign(x: f64, y: f64) -> f64
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).