Issue 3931. Visit children nodes safely.

compiler/java/com/google/dart/compiler/ast/DartNewExpression.java

Index: compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java b/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
index 209a713547cc2146b8daee0473e245802f8b26e3..c2b2a2dcca539e9438704926d2254928facb53d5 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartNewExpression.java
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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.
 
@@ -54,7 +54,7 @@ public class DartNewExpression extends DartInvocation {
 
   @Override
   public void visitChildren(ASTVisitor<?> visitor) {
-    constructor.accept(visitor);
+    safelyVisitChild(constructor, visitor);
     visitor.visit(getArguments());
   }