fix various iterator issues (fixes #181)
diff --git a/example/issues.cpp b/example/issues.cpp
index c8af756..1fa4d57 100644
--- a/example/issues.cpp
+++ b/example/issues.cpp
@@ -57,4 +57,9 @@
         v.push_back(p4);
         return v;
     });
+
+    // #181: iterator passthrough did not compile
+    m2.def("iterator_passthrough", [](py::iterator s) -> py::iterator {
+        return py::make_iterator(std::begin(s), std::end(s));
+    });
 }