test__locale (two underscores) can't pass on Windows:  RADIXCHAR doesn't
exist, and neither do any of the specific 5-letter locale names the test
is looking for.
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 12e65e5..514bbb7 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -554,6 +554,7 @@
 _expectations = {
     'win32':
         """
+        test__locale
         test_al
         test_bsddb185
         test_bsddb3