commit 58076df0c59677111dc77b72852cb2a313a2ef91
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Jan 29 21:42:38 2020 -0800
committer GitHub <noreply@github.com> Wed Jan 29 21:42:38 2020 -0800
tree 5f90a80bfc6fcaad23764ca781fd18de7e1e54f4
parent 696d2324cf2a54e20e8d6a6739fa97ba815a8be9

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

(cherry picked from commit 2e6569b6692298fcc9aae0df3eb3181adb2a5099)

Co-authored-by: Shantanu <hauntsaninja@users.noreply.github.com>

Lib/typing.py

diff --git a/Lib/typing.py b/Lib/typing.py
index 69f6d98..83d310f 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -1848,6 +1848,7 @@
     def close(self) -> None:
         pass
 
+    @property
     @abstractmethod
     def closed(self) -> bool:
         pass

Misc/NEWS.d/next/Library/2020-01-30-01-13-19.bpo-39493.CbFRi7.rst

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
new file mode 100644
index 0000000..b676629
--- /dev/null
+++ 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
\ No newline at end of file