A test was not guaranteeing cleanup in the face of an exception.

Lib/test/test_import.py

@@ -163,9 +163,10 @@ class ImportTests(unittest.TestCase):
         # Need to be able to load from current dir.
         sys.path.append('')
 
+        try:
             # This used to crash.
             exec('import ' + module)
-
+        finally:
             # Cleanup.
             del sys.path[-1]
             unlink(filename + 'c')