core: Add feature gate to rfold example code

rust-lang · Sep 18, 2017 · 7e81cee · 7e81cee
1 parent 84c90f3
commit 7e81cee
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/libcore/iter/traits.rs b/src/libcore/iter/traits.rs
@@ -426,6 +426,7 @@ pub trait DoubleEndedIterator: Iterator {
     /// Basic usage:
     ///
     /// ```
+    /// #![feature(iter_rfold)]
     /// let a = [1, 2, 3];
     ///
     /// // the sum of all of the elements of a
@@ -439,6 +440,7 @@ pub trait DoubleEndedIterator: Iterator {
     /// and continuing with each element from the back until the front:
     ///
     /// ```
+    /// #![feature(iter_rfold)]
     /// let numbers = [1, 2, 3, 4, 5];
     ///
     /// let zero = "0".to_string();