While debugging https://bugs.python.org/issue43921 on Windows, I got a traceback with a single frame and the frame line number is -1.

It looks like a Python 3.11 regression.

Mark, Guido: can it be related to recent optimization work done in the main branch?

See also bpo-44288 "unittest: _is_relevant_tb_level() fails because tb.tb_frame.f_globals=None".

======================================================================
FAIL: test_pha_required_nocert (test.test_ssl.TestPostHandshakeAuth)
----------------------------------------------------------------------
ssl.SSLEOFError: EOF occurred in violation of protocol (_ssl.c:2522)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\vstinner\python\main\lib\test\test_ssl.py", line -1, in test_pha_required_nocert
AssertionError: "certificate required" does not match "EOF occurred in violation of protocol (_ssl.c:2522)"

Is this a re-regression of https://bugs.python.org/issue43933?

this appears to have regressed in 3.10 as well according to some reports on pytest: https://github.com/pytest-dev/pytest/pull/8227#issuecomment-864327090

here's the traceback pytest is trying to display and crashing:

```
Traceback (most recent call last):
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/runner.py", line 311, in from_call
    result: Optional[TResult] = func()
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/runner.py", line 341, in <lambda>
    call = CallInfo.from_call(lambda: list(collector.collect()), "collect")
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/python.py", line 503, in collect
    self._inject_setup_module_fixture()
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/python.py", line 516, in _inject_setup_module_fixture
    self.obj, ("setUpModule", "setup_module")
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/python.py", line 291, in obj
    self._obj = obj = self._getobj()
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/python.py", line 500, in _getobj
    return self._importtestmodule()
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/python.py", line 578, in _importtestmodule
    mod = import_path(self.fspath, mode=importmode)
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/pathlib.py", line 524, in import_path
    importlib.import_module(module_name)
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/_pytest/assertion/rewrite.py", line 170, in exec_module
    exec(co, module.__dict__)
  File "/tmp/rinohtype/tests/test_attribute.py", line 11, in <module>
    from rinoh.attribute import Attribute, Bool
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/rinoh/__init__.py", line 41, in <module>
    from . import resource
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/rinoh/resource.py", line 205, in <module>
    from .template import DocumentTemplate
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/rinoh/template.py", line 42, in <module>
    from .stylesheets import sphinx
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/rinoh/stylesheets/__init__.py", line 42, in <module>
    .format(stylesheet.description, stylesheet))
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/rinoh/style.py", line 670, in __str__
    for name, entry_point in self.installed_resources:
  File "/tmp/rinohtype/venv/lib/python3.10/site-packages/rinoh/resource.py", line 54, in installed_resources
    for entry_point in ilm.entry_points()[cls.entry_point_group]:
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/importlib/metadata/__init__.py", line 979, in entry_points
    return SelectableGroups.load(eps).select(**params)
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/importlib/metadata/__init__.py", line 437, in load
    ordered = sorted(eps, key=by_group)
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/importlib/metadata/__init__.py", line -1, in <genexpr>
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/importlib/metadata/_itertools.py", line 16, in unique_everseen
    k = key(element)
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/importlib/metadata/__init__.py", line 600, in _normalized_name
    return Prepared.normalize(self.name)
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/importlib/metadata/__init__.py", line 841, in normalize
    return re.sub(r"[-_.]+", "-", name).lower().replace('-', '_')
  File "/home/asottile/workspace/cpython/prefix/lib/python3.10/re.py", line 187, in sub
    return _compile(pattern, flags).sub(repl, string, count)
TypeError: expected string or bytes-like object
```

here is a minimal reproduction:

```python
def iterboom():
    raise AssertionError
    yield 1

next(1 for x in iterboom())
```

python 3.9:


```
$ python3.9 t.py
Traceback (most recent call last):
  File "/tmp/rinohtype/t.py", line 5, in <module>
    next(1 for x in iterboom())
  File "/tmp/rinohtype/t.py", line 5, in <genexpr>
    next(1 for x in iterboom())
  File "/tmp/rinohtype/t.py", line 2, in iterboom
    raise AssertionError
AssertionError
```

```
$ python3.10 t.py
Traceback (most recent call last):
  File "/tmp/rinohtype/t.py", line 5, in <module>
    next(1 for x in iterboom())
  File "/tmp/rinohtype/t.py", line -1, in <genexpr>
  File "/tmp/rinohtype/t.py", line 2, in iterboom
    raise AssertionError
AssertionError
```

Thanks Anthony, that's a big help.

New changeset 82e5c28af7049c4f5343c808f172cbe2e145f49b by Mark Shannon in branch 'main':
bpo-44297: Fix missing line number in generator expressions (GH-26801)
https://github.com/python/cpython/commit/82e5c28af7049c4f5343c808f172cbe2e145f49b

New changeset 7674c83d81905d6afe989ca3f93f08b7939b057c by Mark Shannon in branch '3.10':
bpo-44297: Fix missing line number in generator expressions (GH-26821)
https://github.com/python/cpython/commit/7674c83d81905d6afe989ca3f93f08b7939b057c

Can the issue be closed?

I'm not sure which assertion failed in test_ssl.test_pha_required_nocert(). I bet on this one:

                with self.assertRaisesRegex(
                    ssl.SSLError,
                    '(certificate required|EOF occurred)'
                ):

I don't know if the commit 82e5c28af7049c4f5343c808f172cbe2e145f49b is supported is to fix issue or not.

Oh, I can still reproduce the issue on the main branch with this patch:

diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index cee97a8302..3f66818ae1 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -4499,7 +4499,7 @@ def msg_cb(conn, direction, version, content_type, msg_type, data):
                 # server aborts connection with an error.
                 with self.assertRaisesRegex(
                     ssl.SSLError,
-                    '(certificate required|EOF occurred)'
+                    'xxxxxxxxxxxxx'
                 ):
                     # receive CertificateRequest
                     data = s.recv(1024)



$ ./python -m test test_ssl -m test_pha_required_nocert -v
(...)
FAIL: test_pha_required_nocert (test.test_ssl.TestPostHandshakeAuth)
----------------------------------------------------------------------
(...)
Traceback (most recent call last):
  File "/home/vstinner/python/main/Lib/test/test_ssl.py", line -1, in test_pha_required_nocert
AssertionError: (...)
...


=> "line -1"

Here presumably the error is occurring somewhere near unittest. I've tested this and wrote a minimal reproducible example. 

```
import unittest

class TestingError(unittest.TestCase):
    def test_negative_one(self):
        with self.assertRaisesRegex(AssertionError, "xxxxx"):
            self.assertEqual(1, 2)
```

Running this with `unittest discover` or in any other command-line way (like -c) results in frame with -1 while running it from script (with unittest.main probably) does not.

Hope this helps.

Oh it is also occurring when running from script (I ran it from IDLE and it always results in correct lineno). I wrote example similar to how unittests work and the frame with -1 lineno is also occurring there. Here is the code -

```
class A:
    def __enter__(self):
        return self
    def __exit__(self, *args, **kwargs):
        raise Exception("Frame is -1 if program is run from command line")

with A():
    raise Exception("Normal Error")
```

Also, unsurprisingly, pdb fails with a "TypeError: '>=' not supported between instances of 'NoneType' and 'int'". Full pdb log -

Traceback (most recent call last):
  File "C:\Users\shrey\Desktop\line_negative_one.py", line -1, in <module>
  File "C:\github\cpython\lib\bdb.py", line 96, in trace_dispatch
    return self.dispatch_exception(frame, arg)
  File "C:\github\cpython\lib\bdb.py", line 169, in dispatch_exception
    if self.stop_here(frame):
  File "C:\github\cpython\lib\bdb.py", line 212, in stop_here
    return frame.f_lineno >= self.stoplineno
TypeError: '>=' not supported between instances of 'NoneType' and 'int'

Thanks for the reproducer.

Found the culprit - https://github.com/python/cpython/blob/769d7d0c66c5b86e2dd29b9ce67ac2daaab1bb38/Python/compile.c#L5268

Same goes for async with - https://github.com/python/cpython/blob/769d7d0c66c5b86e2dd29b9ce67ac2daaab1bb38/Python/compile.c#L5171
(Didn't test async with so I can be wrong there.)

Is this intentional? I removed these lines and the line number is coming correct. Can changing this affect other use cases?

Without the change:


Traceback (most recent call last):
  File "C:\Users\shrey\Desktop\line_negative_one.py", line 8, in <module>
    raise Exception("Normal Error")
Exception: Normal Error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\shrey\Desktop\line_negative_one.py", line -1, in <module>
  File "C:\Users\shrey\Desktop\line_negative_one.py", line 5, in __exit__
    raise Exception("Frame is -1 if program is run from command line")
Exception: Frame is -1 if program is run from command line



With the change:



Traceback (most recent call last):
  File "C:\Users\shrey\Desktop\line_negative_one.py", line 8, in <module>
    raise Exception("Normal Error")
Exception: Normal Error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\shrey\Desktop\line_negative_one.py", line 7, in <module>
    with A():
  File "C:\Users\shrey\Desktop\line_negative_one.py", line 5, in __exit__
    raise Exception("Frame is -1 if program is run from command line")
Exception: Frame is not -1 anymore if program is run from command line

New changeset 0b6b2865187bca7ed7f1f511a02fc8bd13ee38ca by Mark Shannon in branch '3.10':
bpo-44297: Add a regression test for line numbers in with statements (GH-26891)
https://github.com/python/cpython/commit/0b6b2865187bca7ed7f1f511a02fc8bd13ee38ca

I believe this to be fixed.