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-rw-r--r--library/std/src/primitive_docs.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/library/std/src/primitive_docs.rs b/library/std/src/primitive_docs.rs
index cbe269557ea..fb62c3c63ca 100644
--- a/library/std/src/primitive_docs.rs
+++ b/library/std/src/primitive_docs.rs
@@ -594,6 +594,7 @@ mod prim_array {}
 /// [dynamically sized types](../reference/dynamically-sized-types.html).
 ///
 /// ```
+/// # use std::rc::Rc;
 /// let pointer_size = std::mem::size_of::<&u8>();
 /// assert_eq!(2 * pointer_size, std::mem::size_of::<&[u8]>());
 /// assert_eq!(2 * pointer_size, std::mem::size_of::<*const [u8]>());