core: Stabilize FusedIterator

FusedIterator is a marker trait that promises that the implementing
iterator continues to return `None` from `.next()` once it has returned
`None` once (and/or `.next_back()`, if implemented).

The effects of FusedIterator are already widely available through
`.fuse()`, but with stable `FusedIterator`, stable Rust users can
implement this trait for their iterators when appropriate.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/liballoc/binary_heap.rs b/src/liballoc/binary_heap.rs
index 3041f85cd4c..a5694a90dbc 100644
--- a/src/liballoc/binary_heap.rs
+++ b/src/liballoc/binary_heap.rs
@@ -964,7 +964,7 @@ impl<'a, T> ExactSizeIterator for Iter<'a, T> {
     }
 }
 
-#[unstable(feature = "fused", issue = "35602")]
+#[stable(feature = "fused", since = "1.25.0")]
 impl<'a, T> FusedIterator for Iter<'a, T> {}
 
 /// An owning iterator over the elements of a `BinaryHeap`.
@@ -1019,7 +1019,7 @@ impl<T> ExactSizeIterator for IntoIter<T> {
     }
 }
 
-#[unstable(feature = "fused", issue = "35602")]
+#[stable(feature = "fused", since = "1.25.0")]
 impl<T> FusedIterator for IntoIter<T> {}
 
 /// A draining iterator over the elements of a `BinaryHeap`.
@@ -1065,7 +1065,7 @@ impl<'a, T: 'a> ExactSizeIterator for Drain<'a, T> {
     }
 }
 
-#[unstable(feature = "fused", issue = "35602")]
+#[stable(feature = "fused", since = "1.25.0")]
 impl<'a, T: 'a> FusedIterator for Drain<'a, T> {}
 
 #[stable(feature = "binary_heap_extras_15", since = "1.5.0")]