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gh-98886: Fix issues with dataclass fields with special underscore names (#102032) This commit prefixes `__dataclass` to several things in the locals dict: - Names like `_dflt_` (which cause trouble, see first test) - Names like `_type_` (not known to be able to cause trouble) - `_return_type` (not known to able to cause trouble) - `_HAS_DEFAULT_FACTORY` (which causes trouble, see second test) In addition, this removes `MISSING` from the locals dict. As far as I can tell, this wasn't needed even in the initial implementation of dataclasses.py (and tests on that version passed with it removed). This makes me wary :-) This is basically a continuation of #96151, where fixing this was welcomed in https://github.com/python/cpython/pull/98143#issuecomment-1280306360
2023-03-25 21:40:11 +00:00
Fix issues when defining dataclasses that have fields with specific underscore names that aren't clearly reserved by :mod:`dataclasses`.