diff -r 219d7a7304f8 -r 038275cd92ed tuple.lua
--- a/tuple.lua	Sun May 07 20:02:53 2017 +0100
+++ b/tuple.lua	Tue Jan 16 16:39:48 2018 +0000
@@ -1,10 +1,13 @@
 
-module("tuple")
+--@module tuple
+local tuple={}
 
-function fst(a, b)
+function tuplefst(a, b)
     return a
 end
 
-function snd(a, b)
+function tuple.snd(a, b)
     return b
 end
+
+return tuple