Detect attempts to use super() in NamedTuple methods #1683
Description
Summary
This raises a TypeError on Python 3.14+ at runtime:
% uvx python3.14
Python 3.14.0 (main, Oct 10 2025, 12:54:13) [Clang 20.1.4 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from typing import NamedTuple
>>> class F(NamedTuple):
... x: int
... def method(self):
... super()
...
Traceback (most recent call last):
File "<python-input-1>", line 1, in <module>
class F(NamedTuple):
...<2 lines>...
super()
File "/Users/alexw/Library/Application Support/uv/python/cpython-3.14.0-macos-aarch64-none/lib/python3.14/typing.py", line 2954, in __new__
raise TypeError(
"uses of super() and __class__ are unsupported in methods of NamedTuple subclasses")
TypeError: uses of super() and __class__ are unsupported in methods of NamedTuple subclassesand raises RuntimeError (with a confusing error message) on older versions of Python:
Python 3.13.1 (main, Jan 3 2025, 12:04:03) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from typing import NamedTuple
>>> class F(NamedTuple):
... x: int
... def method(self):
... super()
...
Traceback (most recent call last):
File "<python-input-1>", line 1, in <module>
class F(NamedTuple):
...<2 lines>...
super()
RuntimeError: __class__ not set defining 'F' as <class '__main__.F'>. Was __classcell__ propagated to type.__new__?Version
No response