From 9e2c74eebc125241ac70340785e26aeca7efc90a Mon Sep 17 00:00:00 2001
From: David Wilson <dw@botanicus.net>
Date: Wed, 27 Sep 2017 13:58:44 +0530
Subject: [PATCH] importer: Don't respond to non-.py[co] imports.

---
 mitogen/master.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mitogen/master.py b/mitogen/master.py
index bbf0d687..4eebc839 100644
--- a/mitogen/master.py
+++ b/mitogen/master.py
@@ -416,7 +416,12 @@ class ModuleFinder(object):
 
         if 'six.moves' in fullname:
             # TODO: causes inspect.getsource() to explode.
-            return
+            return None, None, None
+
+        modpath = getattr(sys.modules[fullname], '__file__', '')
+        if not modpath.rstrip('co').endswith('.py'):
+            # Probably a native module.
+            return None, None, None
 
         is_pkg = hasattr(sys.modules[fullname], '__path__')
         try: