diff --git a/dup_expr.cc b/dup_expr.cc
index 7309ae1b5..09ef949c4 100644
--- a/dup_expr.cc
+++ b/dup_expr.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: dup_expr.cc,v 1.15 2003/05/30 02:55:32 steve Exp $"
+#ident "$Id: dup_expr.cc,v 1.16 2003/10/31 02:47:11 steve Exp $"
 #endif
 
 # include "config.h"
@@ -121,6 +121,13 @@ NetEUnary* NetEUnary::dup_expr() const
       return tmp;
 }
 
+NetEUReduce* NetEUReduce::dup_expr() const
+{
+      NetEUReduce*tmp = new NetEUReduce(op_, expr_->dup_expr());
+      assert(tmp);
+      return tmp;
+}
+
 NetEVariable* NetEVariable::dup_expr() const
 {
       NetEVariable*tmp = new NetEVariable(var_);
@@ -129,6 +136,9 @@ NetEVariable* NetEVariable::dup_expr() const
 
 /*
  * $Log: dup_expr.cc,v $
+ * Revision 1.16  2003/10/31 02:47:11  steve
+ *  NetEUReduce has its own dup_expr method.
+ *
  * Revision 1.15  2003/05/30 02:55:32  steve
  *  Support parameters in real expressions and
  *  as real expressions, and fix multiply and
diff --git a/eval_tree.cc b/eval_tree.cc
index 85793cddd..b85239977 100644
--- a/eval_tree.cc
+++ b/eval_tree.cc
@@ -17,7 +17,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: eval_tree.cc,v 1.58 2003/10/26 04:54:56 steve Exp $"
+#ident "$Id: eval_tree.cc,v 1.59 2003/10/31 02:47:11 steve Exp $"
 #endif
 
 # include "config.h"
@@ -1419,6 +1419,8 @@ NetEConst* NetEUnary::eval_tree()
 		return new NetEConst(val);
 	  }
 
+	  case '!':
+	    assert(0);
 	  default:
 	    return 0;
       }
@@ -1513,6 +1515,9 @@ NetEConst* NetEUReduce::eval_tree()
 
 /*
  * $Log: eval_tree.cc,v $
+ * Revision 1.59  2003/10/31 02:47:11  steve
+ *  NetEUReduce has its own dup_expr method.
+ *
  * Revision 1.58  2003/10/26 04:54:56  steve
  *  Support constant evaluation of binary ^ operator.
  *
diff --git a/netlist.h b/netlist.h
index a094d68bf..a56dac602 100644
--- a/netlist.h
+++ b/netlist.h
@@ -19,7 +19,7 @@
  *    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  */
 #ifdef HAVE_CVS_IDENT
-#ident "$Id: netlist.h,v 1.303 2003/10/26 04:51:38 steve Exp $"
+#ident "$Id: netlist.h,v 1.304 2003/10/31 02:47:11 steve Exp $"
 #endif
 
 /*
@@ -2869,6 +2869,7 @@ class NetEUReduce : public NetEUnary {
 
       virtual bool set_width(unsigned w);
       virtual NetNet* synthesize(Design*);
+      virtual NetEUReduce* dup_expr() const;
       virtual NetEConst* eval_tree();
 
 };
@@ -3309,6 +3310,9 @@ extern ostream& operator << (ostream&, NetNet::Type);
 
 /*
  * $Log: netlist.h,v $
+ * Revision 1.304  2003/10/31 02:47:11  steve
+ *  NetEUReduce has its own dup_expr method.
+ *
  * Revision 1.303  2003/10/26 04:51:38  steve
  *  Output of While is output of while substatement.
  *