Fix traceback, syntax errors, and exception handling (#7015)

* Update codeop from v3.14.3

* Fix traceback, syntax errors, and exception handling

- Improve unclosed bracket detection with "'(' was never closed" message
- Fix IndentationError location to point to end of line
- Implement frame.clear() with proper checks for executing/suspended frames
- Fix exception context chaining for propagated exceptions
- Add traceback.__dir__() and prevent tb_next deletion
- Fix subscript operation source range restoration in compiler
- Change "duplicate parameter" to "duplicate argument" error message
- Refactor duplicate code in asyncgenerator.rs and frame.rs

---------

Co-authored-by: CPython Developers <>

Assisted-by: Codex:gpt-6

Lib/test/test_cmd_line_script.py

@@ -548,8 +548,6 @@ class CmdLineTest(unittest.TestCase):
             self.assertIn(b'Exception in __main__ module', err)
             self.assertIn(b'Traceback', err)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_pep_409_verbiage(self):
         # Make sure PEP 409 syntax properly suppresses
         # the context of an exception