mypyc internal error: should be unreachable on final NamedTuple #927
Description
Annotating a NamedTuple with @final leads to a RuntimeError when trying to import the compiled module.
t.py:
from typing import NamedTuple
from typing import final
@final
class T(NamedTuple):
x: int$ virtualenv venv
$ . venv/bin/activate
$ python -VV
Python 3.10.4 (main, Mar 23 2022, 23:05:40) [GCC 11.2.0]
$ pip install git+https://github.com/python/mypy
$ mypyc --version
mypy 0.960+dev.7fbf4deb845d6041700d1addc6eaa2097560f0f3 (compiled: no)
$ mypyc t.py
$ python -c "import t"
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "t.py", line 4, in <module>
@final
RuntimeError: mypyc internal error: should be unreachable