This is an automated cherry-pick of tikv#16641

close tikv#16639

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>

components/raftstore/src/store/msg.rs

@@ -748,6 +748,10 @@ pub struct InspectedRaftMessage {
 
 /// Message that can be sent to a peer.
 #[allow(clippy::large_enum_variant)]
+<<<<<<< HEAD
+=======
+#[derive(EnumCount, EnumVariantNames)]
+>>>>>>> 19affe077f (raftstore: Fix store msg discriminant out of bound (#16641))
 pub enum PeerMsg<EK: KvEngine> {
     /// Raft message is the message sent between raft nodes in the same
     /// raft group. Messages need to be redirected to raftstore if target
@@ -861,10 +865,6 @@ where
         inspector: LatencyInspector,
     },
 
-    /// Message only used for test.
-    #[cfg(any(test, feature = "testexport"))]
-    Validate(Box<dyn FnOnce(&crate::store::Config) + Send>),
-
     UnsafeRecoveryReport(pdpb::StoreReport),
     UnsafeRecoveryCreatePeer {
         syncer: UnsafeRecoveryExecutePlanSyncer,
@@ -876,6 +876,10 @@ where
     AwakenRegions {
         abnormal_stores: Vec<u64>,
     },
+
+    /// Message only used for test.
+    #[cfg(any(test, feature = "testexport"))]
+    Validate(Box<dyn FnOnce(&crate::store::Config) + Send>),
 }
 
 impl<EK: KvEngine> ResourceMetered for StoreMsg<EK> {}
@@ -901,8 +905,6 @@ where
             ),
             StoreMsg::Tick(tick) => write!(fmt, "StoreTick {:?}", tick),
             StoreMsg::Start { ref store } => write!(fmt, "Start store {:?}", store),
-            #[cfg(any(test, feature = "testexport"))]
-            StoreMsg::Validate(_) => write!(fmt, "Validate config"),
             StoreMsg::UpdateReplicationMode(_) => write!(fmt, "UpdateReplicationMode"),
             StoreMsg::LatencyInspect { .. } => write!(fmt, "LatencyInspect"),
             StoreMsg::UnsafeRecoveryReport(..) => write!(fmt, "UnsafeRecoveryReport"),
@@ -911,6 +913,32 @@ where
             }
             StoreMsg::GcSnapshotFinish => write!(fmt, "GcSnapshotFinish"),
             StoreMsg::AwakenRegions { .. } => write!(fmt, "AwakenRegions"),
+            #[cfg(any(test, feature = "testexport"))]
+            StoreMsg::Validate(_) => write!(fmt, "Validate config"),
+        }
+    }
+}
+<<<<<<< HEAD
+=======
+
+impl<EK: KvEngine> StoreMsg<EK> {
+    pub fn discriminant(&self) -> usize {
+        match self {
+            StoreMsg::RaftMessage(_) => 0,
+            StoreMsg::StoreUnreachable { .. } => 1,
+            StoreMsg::CompactedEvent(_) => 2,
+            StoreMsg::ClearRegionSizeInRange { .. } => 3,
+            StoreMsg::Tick(_) => 4,
+            StoreMsg::Start { .. } => 5,
+            StoreMsg::UpdateReplicationMode(_) => 6,
+            StoreMsg::LatencyInspect { .. } => 7,
+            StoreMsg::UnsafeRecoveryReport(_) => 8,
+            StoreMsg::UnsafeRecoveryCreatePeer { .. } => 9,
+            StoreMsg::GcSnapshotFinish => 10,
+            StoreMsg::AwakenRegions { .. } => 11,
+            #[cfg(any(test, feature = "testexport"))]
+            StoreMsg::Validate(_) => 12, // Please keep this always be the last one.
         }
     }
 }
+>>>>>>> 19affe077f (raftstore: Fix store msg discriminant out of bound (#16641))