X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FElement.java;h=896540e904f0868bfe1dd4f68ee3fa630ecde6b9;hp=0d7fb84f583ea0ba9594a9b23cf88d83998afafc;hb=82f9b8d4a2fadb14cb004e5cc9f14944458f2e6c;hpb=189d68c64f7aaec90b7cdef0fb2c358fe4f0dd21

diff --git a/src/edu/berkeley/sbp/Element.java b/src/edu/berkeley/sbp/Element.java
index 0d7fb84..896540e 100644
--- a/src/edu/berkeley/sbp/Element.java
+++ b/src/edu/berkeley/sbp/Element.java
@@ -10,6 +10,9 @@ import java.lang.ref.*;
 /** the root superclass for all components of the grammar (terminals, nonterminals, literals, etc) */
 public abstract class Element {
 
+    /** sorry, you can't make up new, custom elements */
+    Element() { }
+
     abstract StringBuffer toString(StringBuffer sb);
 
     /** returns the Forest resulting from matching this element against the empty string */