Report UNMATCHED_TOKEN instead of EXTRANEOUS_MODIFIER

tests/compiler/dart2js/error_token_test.dart

Index: tests/compiler/dart2js/error_token_test.dart
diff --git a/tests/compiler/dart2js/error_token_test.dart b/tests/compiler/dart2js/error_token_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2000f1a1fabd3c77f05c2a5d65ac7ac0f308c3a3
--- /dev/null
+++ b/tests/compiler/dart2js/error_token_test.dart
@@ -0,0 +1,52 @@
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Test that we don't report invalid modifier on error tokens.
+
+library dart2js.test.error_token;
+
+import 'dart:async';
+import 'package:async_helper/async_helper.dart';
+import "package:compiler/src/diagnostics/messages.dart";
+import 'package:expect/expect.dart';
+import 'memory_compiler.dart';
+
+Future runTest(String code, {MessageKind error}) async {
+  DiagnosticCollector diagnostics = new DiagnosticCollector();
+  OutputCollector output = new OutputCollector();
+  await runCompiler(
+      entryPoint: Uri.parse('memory:main.dart'),
+      memorySourceFiles: {'main.dart': code},
+      diagnosticHandler: diagnostics,
+      outputProvider: output);
+
+  Expect.equals(error != null ? 1 : 0, diagnostics.errors.length);
+  if (error != null) {
+    Expect.equals(error, diagnostics.errors.first.message.kind);
+  }
+  Expect.equals(0, diagnostics.warnings.length);
+  Expect.equals(0, diagnostics.hints.length);
+  Expect.equals(0, diagnostics.infos.length);
+}
+
+void main() {
+  asyncTest(() async {
+    await runTest('''
+main() {}
+class Foo {
+	static void bar() {
+		baz());
+	}
+}
+''', error: MessageKind.UNMATCHED_TOKEN);
+
+    await runTest('''
+main() {}
+class C {
+  C(v) {
+    throw '');
+  }
+}''', error: MessageKind.UNMATCHED_TOKEN);
+  });
+}