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-rw-r--r--src/libcore/time.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libcore/time.rs b/src/libcore/time.rs
index cf88ff2e10f..d94f2378058 100644
--- a/src/libcore/time.rs
+++ b/src/libcore/time.rs
@@ -228,6 +228,7 @@ impl Duration {
     /// # Examples
     ///
     /// ```
+    /// #![feature(duration_zero)]
     /// use std::time::Duration;
     ///
     /// let duration = Duration::zero();
@@ -247,6 +248,7 @@ impl Duration {
     /// # Examples
     ///
     /// ```
+    /// #![feature(duration_zero)]
     /// use std::time::Duration;
     ///
     /// assert!(Duration::zero().is_zero());