Issue 839: Bad code leading to top level methods being something other than identifier

compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java

Index: compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
diff --git a/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java b/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
index fffddd6f93b4b705cd93e3852268c6a251e35cf6..899e91af681892ddf30ca2074074b79670e8b74b 100644
--- a/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
+++ b/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
@@ -342,7 +342,9 @@ public abstract class BaseASTWriter {
 
     @Override
     public Object visitFunctionExpression(DartFunctionExpression node) {
-      write("DartFunctionExpression", node);
+      DartIdentifier name = node.getName();
+      write("DartFunctionExpression", node, name != null ? name.toString() : "");
+      visitChildren(node);
       return null;
     }