Remove unused variable in static constructors
diff --git a/src/ProtocolBuffers.Test/TestProtos/UnitTestImportProtoFile.cs b/src/ProtocolBuffers.Test/TestProtos/UnitTestImportProtoFile.cs
index 1606896..4181f8f 100644
--- a/src/ProtocolBuffers.Test/TestProtos/UnitTestImportProtoFile.cs
+++ b/src/ProtocolBuffers.Test/TestProtos/UnitTestImportProtoFile.cs
@@ -270,7 +270,7 @@
       }
     }
     static ImportMessage() {
-      pbd::FileDescriptor descriptor = global::Google.ProtocolBuffers.TestProtos.UnitTestImportProtoFile.Descriptor;
+      object.ReferenceEquals(global::Google.ProtocolBuffers.TestProtos.UnitTestImportProtoFile.Descriptor, null);
     }
   }