Łukasz Langa <luk...@langa.pl> added the comment:
Yury, thanks for your patch. I'll review it soon.
Please note that postponed annotations only reveal a problem that we already
had if anybody used a string forward reference:
>>> from dataclasses import dataclass
>>> from typing import get_type_hints
>>> class C:
... pass
...
>>> @dataclass
... class D:
... c: C
...
>>> @dataclass
... class E:
... c: "C"
...
>>> get_type_hints(C.__init__)
{}
>>> get_type_hints(D.__init__)
{'c': <class '__main__.C'>, 'return': <class 'NoneType'>}
>>> get_type_hints(E.__init__)
Traceback (most recent call last):
...
NameError: name 'C' is not defined
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<https://bugs.python.org/issue34776>
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