1 files changed, 9 insertions, 0 deletions
diff --git a/src/google/protobuf/compiler/parser_unittest.cc b/src/google/protobuf/compiler/parser_unittest.cc
index 00112999..45f95df1 100644
--- a/src/google/protobuf/compiler/parser_unittest.cc
+++ b/src/google/protobuf/compiler/parser_unittest.cc
@@ -216,6 +216,15 @@ TEST_F(ParserTest, StopAfterSyntaxIdentifierWithErrors) {
   EXPECT_EQ("1:9: Expected syntax identifier.\n", error_collector_.text_);
 }
 
+TEST_F(ParserTest, WarnIfSyntaxIdentifierOmmitted) {
+  SetupParser("message A {}");
+  FileDescriptorProto file;
+  CaptureTestStderr();
+  EXPECT_TRUE(parser_->Parse(input_.get(), &file));
+  EXPECT_TRUE(
+      GetCapturedTestStderr().find("No syntax specified") != string::npos);
+}
+
 // ===================================================================
 
 typedef ParserTest ParseMessageTest;