Add feature(iter_once_with)

diff --git a/src/libcore/iter/sources.rs b/src/libcore/iter/sources.rs
index 103d02da22f0e6f3ddc83c9c588fe82e2f7b9197..59220b320918b22f285580d012ea27f51e1f3b31 100644 (file)
--- a/src/libcore/iter/sources.rs
+++ b/src/libcore/iter/sources.rs
@@ -443,6 +443,8 @@ unsafe impl<A, F: FnOnce() -> A> TrustedLen for OnceWith<F> {}
 /// Basic usage:
 ///
 /// ```
+/// #![feature(iter_once_with)]
+///
 /// use std::iter;
 ///
 /// // one is the loneliest number