Auto merge of #35856 - phimuemue:master, r=brson

[rust.git] / src / libcore / iter / sources.rs

diff --git a/src/libcore/iter/sources.rs b/src/libcore/iter/sources.rs
index ecd4a78b9e760000686fb8c50f51d7704d8eb31f..da346eaf1db96d24ee991be0bfe431e201217b52 100644 (file)
--- a/src/libcore/iter/sources.rs
+++ b/src/libcore/iter/sources.rs
@@ -8,14 +8,11 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use clone::Clone;
-use default::Default;
 use fmt;
 use marker;
-use option::Option::{self, Some, None};
 use usize;
 
-use super::{DoubleEndedIterator, IntoIterator, Iterator, ExactSizeIterator};
+use super::FusedIterator;
 
 /// An iterator that repeats an element endlessly.
 ///
@@ -44,6 +41,9 @@ impl<A: Clone> DoubleEndedIterator for Repeat<A> {
     fn next_back(&mut self) -> Option<A> { Some(self.element.clone()) }
 }
 
+#[unstable(feature = "fused", issue = "35602")]
+impl<A: Clone> FusedIterator for Repeat<A> {}
+
 /// Creates a new iterator that endlessly repeats a single element.
 ///
 /// The `repeat()` function repeats a single value over and over and over and
@@ -138,6 +138,9 @@ fn len(&self) -> usize {
     }
 }
 
+#[unstable(feature = "fused", issue = "35602")]
+impl<T> FusedIterator for Empty<T> {}
+
 // not #[derive] because that adds a Clone bound on T,
 // which isn't necessary.
 #[stable(feature = "iter_empty", since = "1.2.0")]
@@ -213,6 +216,9 @@ fn len(&self) -> usize {
     }
 }
 
+#[unstable(feature = "fused", issue = "35602")]
+impl<T> FusedIterator for Once<T> {}
+
 /// Creates an iterator that yields an element exactly once.
 ///
 /// This is commonly used to adapt a single value into a [`chain()`] of other