#4736 BufferRWPair.closed shouldn't try to call another property as a function

Lib/io.py

@@ -1167,7 +1167,7 @@ class BufferedRWPair(BufferedIOBase):
 
     @property
     def closed(self):
-        return self.writer.closed()
+        return self.writer.closed
 
 
 class BufferedRandom(BufferedWriter, BufferedReader):

Lib/test/test_io.py

@@ -554,8 +554,9 @@ class BufferedRWPairTest(unittest.TestCase):
         r = MockRawIO(())
         w = MockRawIO()
         pair = io.BufferedRWPair(r, w)
+        self.assertFalse(pair.closed)
 
-        # XXX need implementation
+        # XXX More Tests
 
 
 class BufferedRandomTest(unittest.TestCase):

Misc/NEWS

@@ -86,6 +86,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #4736: io.BufferedRWPair's closed property now functions properly.
+
 - Issue #3954: Fix a potential SystemError in _hotshot.logreader error
   handling.