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-rw-r--r--src/libcore/cell.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
index e3a7f23851c..a9c5de23d94 100644
--- a/src/libcore/cell.rs
+++ b/src/libcore/cell.rs
@@ -220,6 +220,7 @@ impl<T:Copy> Cell<T> {
     /// # Examples
     ///
     /// ```
+    /// # #![feature(core)]
     /// use std::cell::Cell;
     ///
     /// let c = Cell::new(5);