commit 16cec136b75daf438080a5b6685d2679dfa406af
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Sep 25 04:48:52 2019 -0700
committer Carol Willing <carolcode@willingconsulting.com> Wed Sep 25 04:48:52 2019 -0700
tree 28585ccd5f98167c1a56377757dc71f7e2622559
parent 4633355a063c7bf068bdd72dfdd32f4c22cf382f

bpo-38248: Fix inconsistent immediate asyncio.Task cancellation (GH-16330) (GH-16383)

(cherry picked from commit edad4d89e357c92f70c0324b937845d652b20afd)

Co-authored-by: Yury Selivanov <yury@edgedb.com>

Lib/asyncio/tasks.py

diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index a0cb884..38d9827 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -284,7 +284,7 @@
             if self._must_cancel:
                 # Task is cancelled right before coro stops.
                 self._must_cancel = False
-                super().set_exception(exceptions.CancelledError())
+                super().cancel()
             else:
                 super().set_result(exc.value)
         except exceptions.CancelledError: