Auto merge of #43010 - stjepang:stabilize-sort-unstable, r=alexcrichton

Stabilize feature sort_unstable

Closes #40585

src/libcore/slice/mod.rs

@@ -212,15 +212,15 @@ pub trait SliceExt {
     #[stable(feature = "copy_from_slice", since = "1.9.0")]
     fn copy_from_slice(&mut self, src: &[Self::Item]) where Self::Item: Copy;
 
-    #[unstable(feature = "sort_unstable", issue = "40585")]
+    #[stable(feature = "sort_unstable", since = "1.20.0")]
     fn sort_unstable(&mut self)
         where Self::Item: Ord;
 
-    #[unstable(feature = "sort_unstable", issue = "40585")]
+    #[stable(feature = "sort_unstable", since = "1.20.0")]
     fn sort_unstable_by<F>(&mut self, compare: F)
         where F: FnMut(&Self::Item, &Self::Item) -> Ordering;
 
-    #[unstable(feature = "sort_unstable", issue = "40585")]
+    #[stable(feature = "sort_unstable", since = "1.20.0")]
     fn sort_unstable_by_key<B, F>(&mut self, f: F)
         where F: FnMut(&Self::Item) -> B,
               B: Ord;

src/libcore/slice/sort.rs

@@ -351,7 +351,7 @@ fn partition_in_blocks<T, F>(v: &mut [T], pivot: &T, is_less: &mut F) -> usize
 
     if start_l < end_l {
         // The left block remains.
-        // Move it's remaining out-of-order elements to the far right.
+        // Move its remaining out-of-order elements to the far right.
         debug_assert_eq!(width(l, r), block_l);
         while start_l < end_l {
             unsafe {
@@ -363,7 +363,7 @@ fn partition_in_blocks<T, F>(v: &mut [T], pivot: &T, is_less: &mut F) -> usize
         width(v.as_mut_ptr(), r)
     } else if start_r < end_r {
         // The right block remains.
-        // Move it's remaining out-of-order elements to the far left.
+        // Move its remaining out-of-order elements to the far left.
         debug_assert_eq!(width(l, r), block_r);
         while start_r < end_r {
             unsafe {

src/libcore/tests/lib.rs

@@ -34,7 +34,6 @@
 #![feature(slice_patterns)]
 #![feature(slice_rotate)]
 #![feature(sort_internals)]
-#![feature(sort_unstable)]
 #![feature(specialization)]
 #![feature(step_by)]
 #![feature(step_trait)]