Use none as the issue instead of 0

library/alloc/src/slice.rs

@@ -118,7 +118,7 @@
 pub use core::slice::{RSplit, RSplitMut};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{RSplitN, RSplitNMut, SplitN, SplitNMut};
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 pub use core::slice::{GroupBy, GroupByMut};
 
 ////////////////////////////////////////////////////////////////////////////////

library/core/src/slice/iter.rs

@@ -2974,21 +2974,21 @@ fn may_have_side_effect() -> bool {
 ///
 /// [`group_by`]: ../../std/primitive.slice.html#method.group_by
 /// [slices]: ../../std/primitive.slice.html
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 #[derive(Debug)] // FIXME implement Debug to be more user friendly
 pub struct GroupBy<'a, T: 'a, P> {
     slice: &'a [T],
     predicate: P,
 }
 
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 impl<'a, T: 'a, P> GroupBy<'a, T, P> {
     pub(super) fn new(slice: &'a [T], predicate: P) -> Self {
         GroupBy { slice, predicate }
     }
 }
 
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 impl<'a, T: 'a, P> Iterator for GroupBy<'a, T, P>
 where P: FnMut(&T, &T) -> bool,
 {
@@ -3025,7 +3025,7 @@ fn last(self) -> Option<Self::Item> {
     }
 }
 
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 impl<'a, T: 'a, P> DoubleEndedIterator for GroupBy<'a, T, P>
 where P: FnMut(&T, &T) -> bool,
 {
@@ -3046,7 +3046,7 @@ fn next_back(&mut self) -> Option<Self::Item> {
     }
 }
 
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 impl<'a, T: 'a, P> FusedIterator for GroupBy<'a, T, P>
 where P: FnMut(&T, &T) -> bool,
 { }
@@ -3058,21 +3058,21 @@ impl<'a, T: 'a, P> FusedIterator for GroupBy<'a, T, P>
 ///
 /// [`group_by_mut`]: ../../std/primitive.slice.html#method.group_by_mut
 /// [slices]: ../../std/primitive.slice.html
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 #[derive(Debug)] // FIXME implement Debug to be more user friendly
 pub struct GroupByMut<'a, T: 'a, P> {
     slice: &'a mut [T],
     predicate: P,
 }
 
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 impl<'a, T: 'a, P> GroupByMut<'a, T, P> {
     pub(super) fn new(slice: &'a mut [T], predicate: P) -> Self {
         GroupByMut { slice, predicate }
     }
 }
 
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 impl<'a, T: 'a, P> Iterator for GroupByMut<'a, T, P>
 where P: FnMut(&T, &T) -> bool,
 {
@@ -3110,7 +3110,7 @@ fn last(self) -> Option<Self::Item> {
     }
 }
 
-#[unstable(feature = "slice_group_by", issue = "0")]
+#[unstable(feature = "slice_group_by", issue = "none")]
 impl<'a, T: 'a, P> DoubleEndedIterator for GroupByMut<'a, T, P>
 where P: FnMut(&T, &T) -> bool,
 {

library/core/src/slice/mod.rs

@@ -1228,7 +1228,7 @@ pub fn rchunks_exact_mut(&mut self, chunk_size: usize) -> RChunksExactMut<'_, T>
     /// assert_eq!(iter.next(), Some(&[2, 2, 2][..]));
     /// assert_eq!(iter.next(), None);
     /// ```
-    #[unstable(feature = "slice_group_by", issue = "0")]
+    #[unstable(feature = "slice_group_by", issue = "none")]
     #[inline]
     pub fn group_by<F>(&self, pred: F) -> GroupBy<T, F>
     where F: FnMut(&T, &T) -> bool
@@ -1257,7 +1257,7 @@ pub fn group_by<F>(&self, pred: F) -> GroupBy<T, F>
     /// assert_eq!(iter.next(), Some(&mut [2, 2, 2][..]));
     /// assert_eq!(iter.next(), None);
     /// ```
-    #[unstable(feature = "slice_group_by", issue = "0")]
+    #[unstable(feature = "slice_group_by", issue = "none")]
     #[inline]
     pub fn group_by_mut<F>(&mut self, pred: F) -> GroupByMut<T, F>
     where F: FnMut(&T, &T) -> bool