Separate feature gate for wrapping_next_power_of_two

Author: Clar Charr

src/libcore/num/mod.rs

@@ -3433,14 +3433,15 @@ the return value is wrapped to `0`.
 Basic usage:
 
 ```
-#![feature(wrapping_int_impl)]
+#![feature(wrapping_next_power_of_two)]
 ", $Feature, "
 assert_eq!(2", stringify!($SelfT), ".wrapping_next_power_of_two(), 2);
 assert_eq!(3", stringify!($SelfT), ".wrapping_next_power_of_two(), 4);
 assert_eq!(", stringify!($SelfT), "::max_value().wrapping_next_power_of_two(), 0);",
 $EndFeature, "
 ```"),
-            #[unstable(feature = "wrapping_int_impl", issue = "32463")]
+            #[unstable(feature = "wrapping_next_power_of_two", issue = "32463",
+                       reason = "needs decision on wrapping behaviour")]
             pub fn wrapping_next_power_of_two(self) -> Self {
                 self.one_less_than_next_power_of_two().wrapping_add(1)
             }

src/libcore/num/wrapping.rs

@@ -874,15 +874,16 @@ When return value overflows (i.e. `self > (1 << (N-1))` for type
 Basic usage:
 
 ```
-#![feature(wrapping_int_impl)]
+#![feature(wrapping_next_power_of_two)]
 use std::num::Wrapping;
 
 assert_eq!(Wrapping(2", stringify!($t), ").next_power_of_two(), Wrapping(2));
 assert_eq!(Wrapping(3", stringify!($t), ").next_power_of_two(), Wrapping(4));
 assert_eq!(Wrapping(200_u8).next_power_of_two(), Wrapping(0));
 ```"),
                 #[inline]
-                #[unstable(feature = "wrapping_int_impl", issue = "32463")]
+                #[unstable(feature = "wrapping_next_power_of_two", issue = "32463",
+                           reason = "needs decision on wrapping behaviour")]
                 pub fn next_power_of_two(self) -> Self {
                     Wrapping(self.0.wrapping_next_power_of_two())
                 }