new handleInvalidTopLevelDeclaration event in fasta parser

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

 // 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.
 
 library fasta.outline_builder;
 
 import 'package:kernel/ast.dart' show ProcedureKind;
 
 import '../../scanner/token.dart' show Token;
 
@@ skipping 106 matching lines @@
     }
   }
 
   @override
   void endMetadataStar(int count, bool forParameter) {
     debugEvent("MetadataStar");
     push(popList(count) ?? NullValue.Metadata);
   }
 
   @override
+  void handleInvalidTopLevelDeclaration(Token endToken) {
+    debugEvent("InvalidTopLevelDeclaration");
+    pop(); // metadata star
+  }
+
+  @override
   void endHide(Token hideKeyword) {
     debugEvent("Hide");
     List<String> names = pop();
     push(new Combinator.hide(names, hideKeyword.charOffset, library.fileUri));
   }
 
   @override
   void endShow(Token showKeyword) {
     debugEvent("Show");
     List<String> names = pop();
@@ skipping 821 matching lines @@
       docToken = docToken.next;
     }
     return buffer.toString();
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }