mypy 0.990 breaks mypy_django_plugin

[intgr]

mypy 0.990 was released today. When I have mypy 0.990 and mypy_django_plugin enabled, it fails with AssertionError on code that uses the django_cas_ng package.

The problematic code appears to be:

from django.conf import settings as django_settings
# ...
def get_service_url(request: HttpRequest, redirect_to: Optional[str] = None) -> str:
    """Generates application django service URL for CAS"""
    if hasattr(django_settings, 'CAS_ROOT_PROXIED_AS') and django_settings.CAS_ROOT_PROXIED_AS:
    # ^^^^^^^^^^^  

Link to source: https://github.com/django-cas-ng/django-cas-ng/blob/a67653cf85244aa137edbabb3c2e94e07f97c773/django_cas_ng/utils.py#L50-L53

Output:

.../site-packages/django_cas_ng/utils.py:53: error: INTERNAL ERROR -- Please try using mypy master on GitHub:
https://mypy.readthedocs.io/en/stable/common_issues.html#using-a-development-mypy-build
Please report a bug at https://github.com/python/mypy/issues
version: 0.990

The stacktrace:

Traceback (most recent call last):
  File "mypy/checkexpr.py", line 4665, in accept
  File "mypy/nodes.py", line 1957, in accept
  File "mypy/checkexpr.py", line 2769, in visit_op_expr
  File "mypy/checkexpr.py", line 3406, in check_boolean_op
  File "mypy/checker.py", line 5184, in find_isinstance_check
  File "mypy/checker.py", line 5223, in find_isinstance_check_helper
  File "mypy/checker.py", line 6486, in hasattr_type_maps
  File "mypy/checker.py", line 6522, in has_valid_attribute
  File "mypy/checkmember.py", line 191, in analyze_member_access
  File "mypy/checkmember.py", line 210, in _analyze_member_access
  File "mypy/checkmember.py", line 331, in analyze_instance_member_access
  File "mypy/checkmember.py", line 547, in analyze_member_var_access
  File ".../site-packages/mypy_django_plugin/transformers/settings.py", line 24, in get_type_of_settings_attribute
    assert isinstance(ctx.context, MemberExpr)
AssertionError: 

System information

• OS: macOS
• python version: 3.11.0
• django version: 4.1.3
• mypy version: 0.990
• django-stubs version: 1.13.0
• django-stubs-ext version: 0.7.0

[intgr]

When I print out ctx.context in get_type_of_settings_attribute, I get TempNode:-1(Any)

ctx: AttributeContext(type=django.conf.LazySettings, default_attr_type=Any, context=TempNode:-1(Any), api=<mypy.checker.TypeChecker object at 0x10e936700>)

[intgr]

Seems to be caused this new feature of mypy 0.990: python/mypy#13544