diff -r e730da0cd489 Lib/test/test_imp.py
--- a/Lib/test/test_imp.py	Sat Apr 14 16:01:49 2012 +0200
+++ b/Lib/test/test_imp.py	Sat Apr 14 19:25:20 2012 +0100
@@ -209,6 +209,11 @@
             import marshal
             imp.reload(marshal)
 
+    def test_reload_submodule(self):
+        with support.CleanImport('collections.abc'):
+            import collections.abc
+            imp.reload(collections.abc)
+
 
 class PEP3147Tests(unittest.TestCase):
     """Tests of PEP 3147."""