Add must_use on copysign

Added a #[must_use] annotation on copysign, per review feedback.
rust-lang · Oct 18, 2018 · f08db6b · f08db6b
1 parent 9a2e702
commit f08db6b
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diff --git 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) }

diff --git 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) }