use Default derive for InitOnceStatus

Author: beepster4096

src/tools/miri/src/concurrency/sync.rs

@@ -166,20 +166,15 @@ impl<'mir, 'tcx> std::fmt::Debug for InitOnceWaiter<'mir, 'tcx> {
     }
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[derive(Default, Debug, Copy, Clone, PartialEq, Eq,)]
 /// The current status of a one time initialization.
 pub enum InitOnceStatus {
+    #[default]
     Uninitialized,
     Begun,
     Complete,
 }
 
-impl Default for InitOnceStatus {
-    fn default() -> Self {
-        Self::Uninitialized
-    }
-}
-
 /// The one time initialization state.
 #[derive(Default, Debug)]
 struct InitOnce<'mir, 'tcx> {