From d4331c56b4f6fe6f18caf19fc1ecf9fec14f7066 Mon Sep 17 00:00:00 2001
From: alclarks <57201106+alclarks@users.noreply.github.com>
Date: Fri, 21 Feb 2020 08:48:36 +0000
Subject: bpo-9495: avoid confusing chained exception in argparse test
 (GH-17120)

---
 Lib/test/test_argparse.py | 3 ++-
 Misc/ACKS                 | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index b095783..9899a53 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -105,7 +105,8 @@ def stderr_to_parser_error(parse_args, *args, **kwargs):
             code = sys.exc_info()[1].code
             stdout = sys.stdout.getvalue()
             stderr = sys.stderr.getvalue()
-            raise ArgumentParserError("SystemExit", stdout, stderr, code)
+            raise ArgumentParserError(
+                "SystemExit", stdout, stderr, code) from None
     finally:
         sys.stdout = old_stdout
         sys.stderr = old_stderr
diff --git a/Misc/ACKS b/Misc/ACKS
index b11ee9c..976c26e 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -312,6 +312,7 @@ Gilles Civario
 Chris Clark
 Diana Clarke
 Laurie Clark-Michalek
+Alexander Clarkson
 Mike Clarkson
 Andrew Clegg
 Brad Clements
-- 
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