From 719a996f9acfefa5ff3dc49d36e0ef6e57e74fe3 Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Tue, 10 Jun 2014 15:04:19 +0200
Subject: fix

---
 grammar.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'grammar.rb')

diff --git a/grammar.rb b/grammar.rb
index ea16425..0b2bc61 100644
--- a/grammar.rb
+++ b/grammar.rb
@@ -33,7 +33,8 @@ class NT
   end
 
   def to_s
-    "NT<#{@symbol},#{@index}>"
+    return "NT<#{@symbol},#{@index}>" if @index>=0
+    return "NT<#{@symbol}>"
   end
 end
 
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