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-rw-r--r--Doc/whatsnew/3.8.rst6
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diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst
index 3f51535..bab1e06 100644
--- a/Doc/whatsnew/3.8.rst
+++ b/Doc/whatsnew/3.8.rst
@@ -164,6 +164,12 @@ Deprecated
They will be removed in Python 3.9.
(Contributed by Serhiy Storchaka in :issue:`29209`.)
+* Passing an object that is not an instance of
+ :class:`concurrent.futures.ThreadPoolExecutor` to
+ :meth:`asyncio.AbstractEventLoop.set_default_executor()` is
+ deprecated and will be prohibited in Python 3.9.
+ (Contributed by Elvis Pranskevichus in :issue:`34075`.)
+
Removed
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