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-rw-r--r--src/google/protobuf/reflection_ops.cc4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/google/protobuf/reflection_ops.cc b/src/google/protobuf/reflection_ops.cc
index f00997c6..8993a24d 100644
--- a/src/google/protobuf/reflection_ops.cc
+++ b/src/google/protobuf/reflection_ops.cc
@@ -56,7 +56,9 @@ void ReflectionOps::Merge(const Message& from, Message* to) {
const Descriptor* descriptor = from.GetDescriptor();
GOOGLE_CHECK_EQ(to->GetDescriptor(), descriptor)
- << "Tried to merge messages of different types.";
+ << "Tried to merge messages of different types "
+ << "(merge " << descriptor->full_name()
+ << " to " << to->GetDescriptor()->full_name() << ")";
const Reflection* from_reflection = from.GetReflection();
const Reflection* to_reflection = to->GetReflection();