new handleInvalidTopLevelDeclaration event in fasta parser

pkg/front_end/lib/src/fasta/source/unhandled_listener.dart

Index: pkg/front_end/lib/src/fasta/source/unhandled_listener.dart
diff --git a/pkg/front_end/lib/src/fasta/source/unhandled_listener.dart b/pkg/front_end/lib/src/fasta/source/unhandled_listener.dart
index ed72851a426fc21f3ec06534ba3ac5e06ce6635e..448b8e09dd07a7b514001846d1c770fac4afe679 100644
--- a/pkg/front_end/lib/src/fasta/source/unhandled_listener.dart
+++ b/pkg/front_end/lib/src/fasta/source/unhandled_listener.dart
@@ -36,6 +36,12 @@ abstract class UnhandledListener extends StackListener {
   }
 
   @override
+  void handleInvalidTopLevelDeclaration(Token beginToken, Token endToken) {

[ahe, 2017/08/07 13:31:00]

We're supposed to get rid of this class, so I don't think you should add new
features here.

Features that are shared between stack-based listeners belong in
stack_listener.dart.

[danrubel, 2017/08/15 20:13:32]

Yeah. The class name and the class dartdoc should have given me a clue.
Refactored to be handled elsewhere.

+    debugEvent("InvalidTopLevelDeclaration");
+    pop(); // metadata star
+  }
+
+  @override
   void endConditionalUri(Token ifKeyword, Token equalitySign) {
     debugEvent("ConditionalUri");
     popCharOffset();