Mypy fails with inner class

[kasium]

Describe the bug If a ORM class is created inside a function, mypy fails. As soon as the class is outside of a function, it works fine

Expected behavior No error

To Reproduce

from sqlalchemy.orm import declarative_base
from sqlalchemy import Column, Integer

def inner() -> None:
    Base = declarative_base()

    class _DummyTable(Base):
        __tablename__ = "user"
        col1 = Column(Integer, primary_key=True)
    instance = _DummyTable(col1=1)

Error

x.py:13:16: error: Unexpected keyword argument "col1" for "_DummyTable"  [call-arg]
        instance = _DummyTable(col1=1)

Versions.

• OS: Linux
• Python: 3.7.1
• SQLAlchemy: 1.4.22
• mypy: 0.910
• SQLAlchemy2-stubs: 0.0.2a6

[kasium]

As far as I can see this is a limitation with the mypy plugin. I'm open to open/search for an issue on their side if it helps