diff -r 1c9a9e2f7d4d -r 6e7aee618f03 lemon/arg_parser.cc
--- a/lemon/arg_parser.cc	Thu Apr 17 15:18:45 2008 +0100
+++ b/lemon/arg_parser.cc	Thu Apr 17 15:54:30 2008 +0100
@@ -194,6 +194,7 @@
   {
     Opts::iterator i = _opts.find(opt);
     LEMON_ASSERT(i!=_opts.end(), "Unknown option: '"+opt+"'");
+    if(i==_opts.end()) std::cout << "JAJJJJJJJJ\n";
     LEMON_ASSERT(!(i->second.ingroup), 
                  "Option already in option group: '"+opt+"'");
     GroupData &g=_groups[group];