Fix code formatter errors.

Signed-off-by: MaheshRavishankar <[email protected]>

Author: MaheshRavishankar

mlir/include/mlir/Dialect/Transform/Interfaces/TransformInterfaces.h

@@ -1074,17 +1074,17 @@ class ErrorCheckingTrackingListener : public TrackingListener {
   /// resets the error state to "success".
   DiagnosedSilenceableFailure checkAndResetError();
 
-  /// Return the latest match notification message.
+  /// Return the latest match notification message. Returns an empty string
+  /// when no error message was captured.
   std::string getLatestMatchFailureMessage();
 
   /// Return "true" if this tracking listener had a failure.
   bool failed() const;
 
 protected:
-
   void
   notifyMatchFailure(Location loc,
-    function_ref<void(Diagnostic &)> reasonCallback) override;
+                     function_ref<void(Diagnostic &)> reasonCallback) override;
 
   void
   notifyPayloadReplacementNotFound(Operation *op, ValueRange values,
@@ -1099,7 +1099,7 @@ class ErrorCheckingTrackingListener : public TrackingListener {
   int64_t errorCounter = 0;
 
   /// Latest message from match failure notification.
-  std::string matchFailureMsg = "";
+  std::optional<Diagnostic> matchFailure;
 };
 
 /// This is a special rewriter to be used in transform op implementations,

mlir/lib/Dialect/Transform/Interfaces/TransformInterfaces.cpp

@@ -1390,15 +1390,19 @@ void transform::ErrorCheckingTrackingListener::notifyPayloadReplacementNotFound(
   ++errorCounter;
 }
 
-std::string transform::ErrorCheckingTrackingListener::getLatestMatchFailureMessage() {
-  return matchFailureMsg;
+std::string
+transform::ErrorCheckingTrackingListener::getLatestMatchFailureMessage() {
+  if (!matchFailure) {
+    return "";
+  }
+  return matchFailure->str();
 }
 
 void transform::ErrorCheckingTrackingListener::notifyMatchFailure(
-  Location loc, function_ref<void(Diagnostic &)> reasonCallback) {
+    Location loc, function_ref<void(Diagnostic &)> reasonCallback) {
   Diagnostic diag(loc, DiagnosticSeverity::Remark);
   reasonCallback(diag);
-  matchFailureMsg = diag.str();
+  matchFailure = std::move(diag);
 }
 
 //===----------------------------------------------------------------------===//