checkpoint

[sbp.git] / src / edu / berkeley / sbp / Forest.java

diff --git a/src/edu/berkeley/sbp/Forest.java b/src/edu/berkeley/sbp/Forest.java
index 937a229..170604a 100644 (file)
--- a/src/edu/berkeley/sbp/Forest.java
+++ b/src/edu/berkeley/sbp/Forest.java
@@ -222,7 +222,7 @@ public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/
         }
 
         protected String  headToString()         { return tag==null?null:tag.toString(); }
-        protected String  headToJava()           { return null; }
+        protected String  headToJava()           { return "null"; }
         protected String  left()                 { return "{"; }
         protected String  right()                { return "}"; }
         protected boolean ignoreSingleton()      { return false; }
@@ -324,7 +324,7 @@ public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/
     private static final Forest[] emptyForestArray = new Forest[0];
 
     protected String  headToString()    { return null; }
-    protected String  headToJava()      { return null; }
+    protected String  headToJava()      { return "null"; }
     protected String  left()            { return "<?"; }
     protected String  right()           { return "?>"; }
     protected boolean ignoreSingleton() { return true; }