add feature clamp

src/libstd/f32.rs

@@ -962,6 +962,7 @@ impl f32 {
     /// # Examples
     ///
     /// ```
+    /// #![feature(clamp)]
     /// assert!((-3.0f32).clamp(-2.0f32, 1.0f32) == -2.0f32);
     /// assert!((0.0f32).clamp(-2.0f32, 1.0f32) == 0.0f32);
     /// assert!((2.0f32).clamp(-2.0f32, 1.0f32) == 1.0f32);

src/libstd/f64.rs

@@ -884,6 +884,7 @@ impl f64 {
     /// # Examples
     ///
     /// ```
+    /// #![feature(clamp)]
     /// assert!((-3.0f64).clamp(-2.0f64, 1.0f64) == -2.0f64);
     /// assert!((0.0f64).clamp(-2.0f64, 1.0f64) == 0.0f64);
     /// assert!((2.0f64).clamp(-2.0f64, 1.0f64) == 1.0f64);

src/libstd/lib.rs

@@ -240,6 +240,7 @@
 #![feature(cfg_target_thread_local)]
 #![feature(char_error_internals)]
 #![feature(checked_duration_since)]
+#![feature(clamp)]
 #![feature(compiler_builtins_lib)]
 #![feature(concat_idents)]
 #![feature(const_cstr_unchecked)]