bpo-40334: PEP 617 implementation: New PEG parser for CPython (GH-19503)

Co-authored-by: Guido van Rossum <guido@python.org>
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 329f7dd..bd4ea47 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -545,10 +545,10 @@
     def test_sys_flags(self):
         self.assertTrue(sys.flags)
         attrs = ("debug",
-                 "inspect", "interactive", "optimize", "dont_write_bytecode",
-                 "no_user_site", "no_site", "ignore_environment", "verbose",
-                 "bytes_warning", "quiet", "hash_randomization", "isolated",
-                 "dev_mode", "utf8_mode")
+                 "inspect", "interactive", "optimize", "use_peg",
+                 "dont_write_bytecode", "no_user_site", "no_site",
+                 "ignore_environment", "verbose", "bytes_warning", "quiet",
+                 "hash_randomization", "isolated", "dev_mode", "utf8_mode")
         for attr in attrs:
             self.assertTrue(hasattr(sys.flags, attr), attr)
             attr_type = bool if attr == "dev_mode" else int