--- a/setup.py	Mon Mar 21 21:38:56 2016 -0700
+++ b/setup.py	Mon Mar 28 00:50:36 2016 -0700
@@ -3,6 +3,7 @@
 requires = []
 try:
     import mercurial
+    mercurial.__all__
 except ImportError:
     requires.append('mercurial')