From 70d4f263ba3d1db40f246ebe600992abb1ac85be Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Mon, 25 Jan 2016 00:56:34 +0100
Subject: [PATCH] RangeFrom::step_by docs: fix example

The previous example did not do what its description said. In it panicked on integer overflow in debug mode, and went into an infinite loop in release mode (wrapping back to 0 after printing 254).
---
 src/libcore/iter.rs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/libcore/iter.rs b/src/libcore/iter.rs
index ddc4fb32cde..3f1c0f6a549 100644
--- a/src/libcore/iter.rs
+++ b/src/libcore/iter.rs
@@ -4252,13 +4252,15 @@ impl<A: Step> RangeFrom<A> {
     ///
     /// # Examples
     ///
-    /// ```ignore
-    /// for i in (0u8..).step_by(2) {
+    /// ```
+    /// # #![feature(step_by)]
+    ///
+    /// for i in (0u8..).step_by(2).take(10) {
     ///     println!("{}", i);
     /// }
     /// ```
     ///
-    /// This prints all even `u8` values.
+    /// This prints the first ten even natural integers (0 to 18).
     #[unstable(feature = "step_by", reason = "recent addition",
                issue = "27741")]
     pub fn step_by(self, by: A) -> StepBy<A, Self> {