Implement correct scope of for-in expression.

pkg/dart_parser/lib/src/listener.dart

Index: pkg/dart_parser/lib/src/listener.dart
diff --git a/pkg/dart_parser/lib/src/listener.dart b/pkg/dart_parser/lib/src/listener.dart
index 02a57f1eede6567591fa3af61192b59046d72ec0..f09a25139f62eff22bb701683c5fe8f50e44c598 100644
--- a/pkg/dart_parser/lib/src/listener.dart
+++ b/pkg/dart_parser/lib/src/listener.dart
@@ -178,6 +178,13 @@ class Listener {
     logEvent("ForIn");
   }
 
+  void beginForInExpression(Token token) {
+  }
+
+  void endForInExpression(Token token) {
+    logEvent("ForInExpression");
+  }
+
   void beginForInBody(Token token) {
   }