X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FForest.java;h=170604a2e8e0f221c1751b6efd84e00d7a0f2505;hb=280f672a6fd0674a5dfca285791f1e465cac5c9e;hp=937a229420e2f26ea5d6489258aa41f9a773b365;hpb=acfe58223b9a0f78e64a14a1ca5d5998626ee3fe;p=sbp.git

diff --git a/src/edu/berkeley/sbp/Forest.java b/src/edu/berkeley/sbp/Forest.java
index 937a229..170604a 100644
--- 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; }