CoerceUnsized for PinBox

2018-03-15 16:10:18 -07:00
parent e3c5f6958f
commit 2f1c24a60d
1 changed files with 3 additions and 0 deletions
--- a/src/liballoc/boxed.rs
+++ b/src/liballoc/boxed.rs
@@ -989,3 +989,6 @@ impl<T: ?Sized> fmt::Pointer for PinBox<T> {
        fmt::Pointer::fmt(&ptr, f)
    }
 }
+
+#[unstable(feature = "pin", issue = "0")]
+impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<PinBox<U>> for PinBox<T> {}