Mypy v1.18.2, django-stubs 5.2.7, Django 5.1 on python 3.13.9

[jlustgarten]

Bug report

What's wrong

I am running mypy (1.18.2) and django-stubs (5.2.7) on python 3.13 and while doing so, I am getting an INTERNAL ERROR issue that is blocking its use. It is related to an AssertionError on request.pyi:56
Traceback (most recent call last):
File "mypy/semanal.py", line 7350, in accept
File "mypy/nodes.py", line 1624, in accept
File "mypy/semanal.py", line 3272, in visit_assignment_stmt
File "mypy/semanal.py", line 3806, in process_type_annotation
File "mypy/semanal.py", line 6996, in defer
AssertionError: Must not defer during final iteration
venv/lib/python3.13/site-packages/django-stubs/http/request.pyi:56: error: INTERNAL ERROR

How is that should be

It should complete the run without any issue

System information

• OS: macOS Tahoe 26.1
• python version: 3.13.9
• django version: 5.1
• mypy version: 1.18.2
• django-stubs version: 5.2.7
• django-stubs-ext version: 5.2.7

[jlustgarten]

The issue is related to using the mypy config:
explicit_package_biases = True

[UnknownPlatypus]

Hi, could you provide some code snippets that triggers this behavior ?

Ideally adding a failing yml test in the test suite showcasing this behavior