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Editing: _attrs.py
from __future__ import annotations from typing import NoReturn, TypeVar from attrs import define as _define, frozen as _frozen _T = TypeVar("_T") def define(cls: type[_T]) -> type[_T]: # pragma: no cover cls.__init_subclass__ = _do_not_subclass return _define(cls) def frozen(cls: type[_T]) -> type[_T]: cls.__init_subclass__ = _do_not_subclass return _frozen(cls) class UnsupportedSubclassing(Exception): pass @staticmethod def _do_not_subclass() -> NoReturn: # pragma: no cover raise UnsupportedSubclassing( "Subclassing is not part of referencing's public API. " "If no other suitable API exists for what you're trying to do, " "feel free to file an issue asking for one.", )
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