DocTestFinder._find():  for tests derived from a module __test__ global,
doctest always promised to stick "__test__" in the name.  That got
broken.  Now it's fixed again.
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
index 2b287ed..d60738b 100644
--- a/Lib/test/test_doctest.py
+++ b/Lib/test/test_doctest.py
@@ -467,8 +467,8 @@
      1  some_module.SampleClass.a_staticmethod
      1  some_module.SampleClass.double
      1  some_module.SampleClass.get
-     1  some_module.c
-     2  some_module.d
+     1  some_module.__test__.c
+     2  some_module.__test__.d
      1  some_module.sample_func
 
 Duplicate Removal