From a4338de38c4ad19bfe75c338b92b29e166547801 Mon Sep 17 00:00:00 2001
From: Bob Lantz <rlantz@cs.stanford.edu>
Date: Thu, 5 Apr 2012 20:57:29 -0700
Subject: [PATCH] Fix error message.

---
 bin/mn | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bin/mn b/bin/mn
index e9d3fd5..29f938c 100755
--- a/bin/mn
+++ b/bin/mn
@@ -44,8 +44,8 @@ def customNode( constructors, argStr ):
         if not newargs:
             return constructor( name, *args, **params )
         if args:
-            warn( 'warning: %s replacing %s with %s\n',
-                  constructor, args, newargs )
+            warn( 'warning: %s replacing %s with %s\n' % (
+                  constructor, args, newargs ) )
         return constructor( name, *newargs, **params )
 
     return customized