Try to restore the old test_file and test_univnewlines as new, different files
(with the right revisions this time, hopefully)
diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index 4b0c759..1974f56 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -1,3 +1,6 @@
+# NOTE: this file tests the new `io` library backported from Python 3.x.
+# Similar tests for the builtin file object can be found in test_file2k.py.
+
 from __future__ import print_function
 
 import sys