--- a/mercurial/windows.py	Wed Jun 03 14:22:21 2015 -0700
+++ b/mercurial/windows.py	Wed May 20 18:00:05 2015 -0500
@@ -371,6 +371,10 @@
     '''check whether a stat result is an executable file'''
     return False
 
+def poll(fds):
+    # see posix.py for description
+    raise NotImplementedError()
+
 def readpipe(pipe):
     """Read all available data from a pipe."""
     chunks = []