Index: Lib/test/test_argparse.py
===================================================================
--- Lib/test/test_argparse.py	(revision 83675)
+++ Lib/test/test_argparse.py	(working copy)
@@ -106,7 +106,10 @@
             code = sys.exc_info()[1].code
             stdout = sys.stdout.getvalue()
             stderr = sys.stderr.getvalue()
-            raise ArgumentParserError("SystemExit", stdout, stderr, code)
+            # Avoid exception chaining, which produces a confusing error
+            # if the raise is not expected, by delaying the raise.
+            exc = ArgumentParserError("SystemExit", stdout, stderr, code)
+        raise exc
     finally:
         sys.stdout = old_stdout
         sys.stderr = old_stderr