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## Summary Synthesize a `__setattr__` method with a return type of `Never` for frozen dataclasses. https://docs.python.org/3/library/dataclasses.html#frozen-instances https://docs.python.org/3/library/dataclasses.html#dataclasses.FrozenInstanceError ### Related https://github.com/astral-sh/ty/issues/111 https://github.com/astral-sh/ruff/pull/17974#discussion_r2108527106 https://github.com/astral-sh/ruff/pull/18347#discussion_r2128174665 ## Test Plan New Markdown tests --------- Co-authored-by: David Peter <mail@david-peter.de>