Issue 3931. Visit children nodes safely.

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

Index: compiler/java/com/google/dart/compiler/ast/DartGotoStatement.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartGotoStatement.java b/compiler/java/com/google/dart/compiler/ast/DartGotoStatement.java
index 3ff93e25baa424c2199505e70aed6ff05be279a7..212af3eadd058edbec45fc273b82421bd15035b3 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartGotoStatement.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartGotoStatement.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.
 
@@ -46,8 +46,6 @@ public abstract class DartGotoStatement extends DartStatement {
 
   @Override
   public void visitChildren(ASTVisitor<?> visitor) {
-    if (label != null) {
-      label.accept(visitor);
-    }
+    safelyVisitChild(label, visitor);
   }
 }