diff -r 2f21cc34a245 -r d3ae1f06843d src/lemon/error.h
--- a/src/lemon/error.h	Fri Apr 29 11:04:17 2005 +0000
+++ b/src/lemon/error.h	Fri Apr 29 13:31:41 2005 +0000
@@ -302,6 +302,7 @@
     virtual const char* what() const throw() {
       try {
 	std::ostringstream ostr;
+	ostr << exceptionName() << ": ";
 	if (message()) ostr << message();
 	if( file() || line() != 0 ) {
 	  ostr << " (";