--- forking.py.orig	2010-10-20 09:08:13.234375000 -0400
+++ forking.py	2010-10-17 15:16:43.718750000 -0400
@@ -451,7 +451,8 @@
             else:
                 dirs = [os.path.dirname(main_path)]
 
-            assert main_name not in sys.modules, main_name
+            if main_name != '__main__':
+                assert main_name not in sys.modules, main_name
             file, path_name, etc = imp.find_module(main_name, dirs)
             try:
                 # We would like to do "imp.load_module('__main__', ...)"