From 28f42fd4f813b4be15b47629c557ef8f958727cb Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Wed, 9 Nov 2016 23:49:02 +0200
Subject: [PATCH] Issue #28649: Clear the typing module caches when search for
 reference leaks.

---
 Lib/test/regrtest.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index f870854a677..885b14fd56f 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -1526,6 +1526,14 @@ def dash_R_cleanup(fs, ps, pic, zdc, abcs):
     else:
         ctypes._reset_cache()
 
+    try:
+        typing = sys.modules['typing']
+    except KeyError:
+        pass
+    else:
+        for f in typing._cleanups:
+            f()
+
     # Collect cyclic trash and read memory statistics immediately after.
     func1 = sys.getallocatedblocks
     func2 = sys.gettotalrefcount