New upstream version 1.14.0+dfsg1

[rustc.git] / src / libcore / option.rs

diff --git a/src/libcore/option.rs b/src/libcore/option.rs
index cb18feff7342240e6fdd8c6569f2078124cd078b..607e16887a831b8faaa0fcb22a351ec481f5909d 100644 (file)
--- a/src/libcore/option.rs
+++ b/src/libcore/option.rs
@@ -145,7 +145,7 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
-use iter::{FromIterator, FusedIterator};
+use iter::{FromIterator, FusedIterator, TrustedLen};
 use mem;
 
 // Note that this is not a lang item per se, but it has a hidden dependency on
@@ -803,6 +803,7 @@ impl<A> DoubleEndedIterator for Item<A> {
 
 impl<A> ExactSizeIterator for Item<A> {}
 impl<A> FusedIterator for Item<A> {}
+unsafe impl<A> TrustedLen for Item<A> {}
 
 /// An iterator over a reference of the contained item in an [`Option`].
 ///
@@ -833,6 +834,9 @@ impl<'a, A> ExactSizeIterator for Iter<'a, A> {}
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, A> FusedIterator for Iter<'a, A> {}
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<'a, A> TrustedLen for Iter<'a, A> {}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, A> Clone for Iter<'a, A> {
     fn clone(&self) -> Iter<'a, A> {
@@ -868,6 +872,8 @@ impl<'a, A> ExactSizeIterator for IterMut<'a, A> {}
 
 #[unstable(feature = "fused", issue = "35602")]
 impl<'a, A> FusedIterator for IterMut<'a, A> {}
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<'a, A> TrustedLen for IterMut<'a, A> {}
 
 /// An iterator over the item contained inside an [`Option`].
 ///
@@ -898,6 +904,9 @@ impl<A> ExactSizeIterator for IntoIter<A> {}
 #[unstable(feature = "fused", issue = "35602")]
 impl<A> FusedIterator for IntoIter<A> {}
 
+#[unstable(feature = "trusted_len", issue = "37572")]
+unsafe impl<A> TrustedLen for IntoIter<A> {}
+
 /////////////////////////////////////////////////////////////////////////////
 // FromIterator
 /////////////////////////////////////////////////////////////////////////////
@@ -914,12 +923,12 @@ impl<A, V: FromIterator<A>> FromIterator<Option<A>> for Option<V> {
     /// ```
     /// use std::u16;
     ///
-    /// let v = vec!(1, 2);
+    /// let v = vec![1, 2];
     /// let res: Option<Vec<u16>> = v.iter().map(|&x: &u16|
     ///     if x == u16::MAX { None }
     ///     else { Some(x + 1) }
     /// ).collect();
-    /// assert!(res == Some(vec!(2, 3)));
+    /// assert!(res == Some(vec![2, 3]));
     /// ```
     #[inline]
     fn from_iter<I: IntoIterator<Item=Option<A>>>(iter: I) -> Option<V> {