--- a/rqlrewrite.py	Wed Dec 11 12:22:52 2013 +0100
+++ b/rqlrewrite.py	Thu Dec 12 12:28:43 2013 +0100
@@ -92,6 +92,7 @@
                     for etype in possibletypes:
                         node.append(n.Constant(etype, 'etype'))
                 else:
+                    etype = iter(possibletypes).next()
                     node = n.Constant(etype, 'etype')
                 comp = mytyperel.children[1]
                 comp.replace(comp.children[0], node)