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-rw-r--r--src/libcore/marker.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/marker.rs b/src/libcore/marker.rs
index 1b866501b8e..ae6bcc79539 100644
--- a/src/libcore/marker.rs
+++ b/src/libcore/marker.rs
@@ -319,6 +319,7 @@ impl<T:?Sized> MarkerTrait for T { }
 /// `MarkerTrait`:
 ///
 /// ```
+/// # #![feature(core)]
 /// use std::marker::MarkerTrait;
 /// trait Even : MarkerTrait { }
 /// ```