impl Unpin for PinBox

Author: Nemo157

src/liballoc/boxed.rs

@@ -994,3 +994,6 @@ impl<T: ?Sized> fmt::Pointer for PinBox<T> {
 
 #[unstable(feature = "pin", issue = "49150")]
 impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<PinBox<U>> for PinBox<T> {}
+
+#[unstable(feature = "pin", issue = "49150")]
+unsafe impl<T: ?Sized> Unpin for PinBox<T> {}