new handleInvalidTopLevelDeclaration event in fasta parser

pkg/compiler/lib/src/parser/node_listener.dart

Index: pkg/compiler/lib/src/parser/node_listener.dart
diff --git a/pkg/compiler/lib/src/parser/node_listener.dart b/pkg/compiler/lib/src/parser/node_listener.dart
index 2fb77387828f3488a8ee01ef54ec008a35f1f02e..9d4fe2577d7449cc28ee524f850cd4179a92be02 100644
--- a/pkg/compiler/lib/src/parser/node_listener.dart
+++ b/pkg/compiler/lib/src/parser/node_listener.dart
@@ -18,6 +18,8 @@ import 'element_listener.dart' show ElementListener, ScannerOptions;
 import 'package:front_end/src/fasta/parser.dart' as fasta show Assert;
 
 class NodeListener extends ElementListener {
+  int invalidTopLevelDeclarationCount = 0;
+
   NodeListener(ScannerOptions scannerOptions, DiagnosticReporter reporter,
       CompilationUnitElement element)
       : super(scannerOptions, reporter, element, null);
@@ -118,6 +120,11 @@ class NodeListener extends ElementListener {
         interfaces, beginToken, extendsKeyword, body, endToken));
   }
 
+  @override
+  void handleInvalidTopLevelDeclaration(Token endToken) {
+    ++invalidTopLevelDeclarationCount;
+  }
+
   @override
   void endTopLevelDeclaration(Token token) {
     // TODO(sigmund): consider moving metadata into each declaration
@@ -128,9 +135,15 @@ class NodeListener extends ElementListener {
     super.endTopLevelDeclaration(token);
   }
 
+  @override
+  void beginCompilationUnit(Token token) {
+    invalidTopLevelDeclarationCount = 0;
+  }
+
   @override
   void endCompilationUnit(int count, Token token) {
-    pushNode(makeNodeList(count, null, null, '\n'));
+    pushNode(makeNodeList(
+        count - invalidTopLevelDeclarationCount, null, null, '\n'));
   }
 
   @override