Crash when temporary base class is resolved from mypy cache #218
Description
Describe the bug
Given the code below I regularly run into a mypy crash when the cache is warm.
Expected behavior
No crash
To Reproduce
I am having a hard time to isolate the crash. It seems to be a combination of different (namespace?) packages and a change of the cache is needed. I tried to come up with a minimal example but failed.
Maybe it does ring a bell nevertheless... As the class is created in a function there is no module which can be looked up.
We ran into the issue when introducing a new test which creates a base class within the test function. Whenever we switched branches mypy crashed. The workaound is to move the instantiation out into the model.
from __future__ import annotations
from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
def test_soft():
Base = declarative_base()
class User(Base):
__tablename__ = "user"
id = Column(Integer, primary_key=True)
name = Column(String)Error
Traceback (most recent call last):
File "/Users/armin/venv/weplan3.10/bin/mypy", line 8, in <module>
sys.exit(console_entry())
File "/Users/armin/venv/weplan3.10/lib/python3.10/site-packages/mypy/__main__.py", line 12, in console_entry
main(None, sys.stdout, sys.stderr)
File "mypy/main.py", line 96, in main
File "mypy/main.py", line 173, in run_build
File "mypy/build.py", line 154, in build
File "mypy/build.py", line 230, in _build
File "mypy/build.py", line 2729, in dispatch
File "mypy/build.py", line 3080, in process_graph
File "mypy/build.py", line 3158, in process_fresh_modules
File "mypy/build.py", line 1991, in fix_cross_refs
File "mypy/fixup.py", line 26, in fixup_module
File "mypy/fixup.py", line 91, in visit_symbol_table
File "mypy/fixup.py", line 49, in visit_type_info
File "mypy/types.py", line 1174, in accept
File "mypy/fixup.py", line 156, in visit_instance
File "mypy/fixup.py", line 282, in lookup_fully_qualified_typeinfo
File "mypy/lookup.py", line 29, in lookup_fully_qualified
AssertionError: Cannot find module for Base
Versions.
- Python: 3.10
- SQLAlchemy: 1.4.39
- mypy: 0.961
- SQLAlchemy2-stubs: 0.0.2a24