doc example does nothing

diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index 599b92d05ddd7e21d3337ae2d9045bd1f082d8d4..f37f93a3e51937ed0dba92af9b5fb3ce0f67b571 100644 (file)
--- a/src/libcollections/str.rs
+++ b/src/libcollections/str.rs
@@ -1083,7 +1083,7 @@ fn char_range_at(&self, start: usize) -> CharRange {
     ///
     /// let s = "中华Việt Nam";
     /// let mut i = s.len();
-    /// while i < 0 {
+    /// while i > 0 {
     ///     let CharRange {ch, next} = s.char_range_at_reverse(i);
     ///     println!("{}: {}", i, ch);
     ///     i = next;