Add must_use on copysign

Added a #[must_use] annotation on copysign, per review feedback.
2018-10-18 08:35:09 -07:00 · 2018-10-18 08:35:09 -07:00 · f08db6bf1e
commit f08db6bf1e
parent 9a2e7026dc
2 changed files with 2 additions and 0 deletions
--- a/src/libstd/f32.rs
+++ b/src/libstd/f32.rs
@ -221,6 +221,7 @@ impl f32 {
    /// assert!(f32::NAN.copysign(1.0).is_nan());
    /// ```
    #[inline]
+    #[must_use]
    #[unstable(feature="copysign", issue="55169")]
    pub fn copysign(self, y: f32) -> f32 {
        unsafe { intrinsics::copysignf32(self, y) }
--- a/src/libstd/f64.rs
+++ b/src/libstd/f64.rs
@ -199,6 +199,7 @@ impl f64 {
    /// assert!(f64::NAN.copysign(1.0).is_nan());
    /// ```
    #[inline]
+    #[must_use]
    #[unstable(feature="copysign", issue="55169")]
    pub fn copysign(self, y: f64) -> f64 {
        unsafe { intrinsics::copysignf64(self, y) }