run x.py fmt

Author: ultrabear

Diff for: core/src/mem/maybe_uninit.rs

@@ -569,7 +569,10 @@ impl<T> MaybeUninit<T> {
     /// (Notice that the rules around references to uninitialized data are not finalized yet, but
     /// until they are, it is advisable to avoid them.)
     #[stable(feature = "maybe_uninit", since = "1.36.0")]
-    #[rustc_const_stable(feature = "const_maybe_uninit_as_mut_ptr", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(
+        feature = "const_maybe_uninit_as_mut_ptr",
+        since = "CURRENT_RUSTC_VERSION"
+    )]
     #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_mut_refs))]
     #[inline(always)]
     pub const fn as_mut_ptr(&mut self) -> *mut T {