make the const constructor unstable

rust-lang · May 7, 2018 · b61a4c2 · b61a4c2
1 parent 2843e64
commit b61a4c2
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
@@ -959,6 +959,7 @@ impl<T> ManuallyDrop<T> {
     /// ManuallyDrop::new(Box::new(()));
     /// ```
     #[stable(feature = "manually_drop", since = "1.20.0")]
+    #[rustc_const_unstable(feature = "const_manually_drop_new")]
     #[inline]
     pub const fn new(value: T) -> ManuallyDrop<T> {
         ManuallyDrop { value: value }