diff -r db2ad6541d92 -r 197ba42d78b2 stage3/stage3.cc
--- a/stage3/stage3.cc	Thu Mar 31 17:40:55 2011 +0100
+++ b/stage3/stage3.cc	Thu Mar 31 21:06:36 2011 +0100
@@ -29,6 +29,9 @@
 
 	(*tree_root).accept(visit_expression_type);
 
+	if (visit_expression_type.get_error_found())
+	  return -1;
+	
 	return 0;
 }