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Description
Crash Report & To Reproduce
See mypy Playground.
This is a much less obscure example than #19185, and came about while trying to find workarounds for that snippet. I'm not sure if it's related.
from typing import Generic, TypeVar, TypeAlias
T1 = TypeVar("T1")
T2 = TypeVar("T2", default=T1)
Alias: TypeAlias = "MyClass[T1, T2]"
class MyClass(Generic["T1", "T2"]): ...Traceback
Deferral trace:
__main__:6
__main__:6
__main__:6
__main__:-1
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
__main__:6
main.py: error: INTERNAL ERROR: maximum semantic analysis iteration count reached
Found 1 error in 1 file (errors prevented further checking)
Your Environment
- Mypy version used: 1.15, 1.16
- Mypy command-line flags: --show-traceback
- Mypy configuration options from
mypy.ini(and other config files): None - Python version used: 3.9, 3.12