--- a/minify/optparser.lua	Wed Feb 10 12:33:42 2016 +0000
+++ b/minify/optparser.lua	Fri May 05 09:44:05 2017 +0100
@@ -440,3 +440,5 @@
   local afteruniq = preprocess(localinfo)
   ------------------------------------------------------------------
 end
+
+return _M;