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-rw-r--r--src/liballoc/boxed.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/liballoc/boxed.rs b/src/liballoc/boxed.rs
index 5e5d7b91720..46d3ccb9de5 100644
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -899,6 +899,7 @@ impl<T> Generator for Box<T>
 
 /// A pinned, heap allocated reference.
 #[unstable(feature = "pin", issue = "0")]
+#[fundamental]
 pub struct PinBox<T: ?Sized> {
     inner: Box<T>,
 }