Mark xreadlines deprecated.  Don't use f.xreadlines() in test_iter.py.
diff --git a/Lib/test/test_xreadline.py b/Lib/test/test_xreadline.py
index db9eb6b..0ba4adc 100644
--- a/Lib/test/test_xreadline.py
+++ b/Lib/test/test_xreadline.py
@@ -1,5 +1,8 @@
 from test.test_support import verbose
 
+import warnings
+warnings.filterwarnings('ignore', "xreadlines", DeprecationWarning)
+
 class XReader:
     def __init__(self):
         self.count = 5