bpo-39493: Fix definition of IO.closed in typing.py (#18265)

hauntsaninja · web-flow · commit 2e6569b66922 · 2020-01-29T18:52:36.000-08:00
diff --git a/Lib/typing.py b/Lib/typing.py
@@ -1831,6 +1831,7 @@ def name(self) -> str:
     def close(self) -> None:
         pass
 
+    @property
     @abstractmethod
     def closed(self) -> bool:
         pass
diff --git a/Misc/NEWS.d/next/Library/2020-01-30-01-13-19.bpo-39493.CbFRi7.rst b/Misc/NEWS.d/next/Library/2020-01-30-01-13-19.bpo-39493.CbFRi7.rst
@@ -0,0 +1 @@
+Mark ``typing.IO.closed`` as a property
