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| -rw-r--r-- | src/libcore/iter.rs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/libcore/iter.rs b/src/libcore/iter.rs index fcc6e72b9bb..3d17b10ba3a 100644 --- a/src/libcore/iter.rs +++ b/src/libcore/iter.rs @@ -98,6 +98,13 @@ pub trait Iterator { /// /// An upper bound of `None` means either there is no known upper bound, or /// the upper bound does not fit within a `usize`. + /// + /// # Examples + /// + /// ``` + /// let it = (0..10).filter(|x| x % 2 == 0).chain(15..20); + /// assert_eq!((5, Some(15)), it.size_hint()); + /// ``` #[inline] #[stable(feature = "rust1", since = "1.0.0")] fn size_hint(&self) -> (usize, Option<usize>) { (0, None) } |