Alex Waygood <alex.wayg...@gmail.com> added the comment:

@Nikita, I had a go at writing some more rigorous tests regarding this issue. I 
found the same thing you did -- the issue seems:

* Isolated to dataclasses specifically (doesn't occur with TypedDicts, standard 
classes or NamedTuples)
* Isolated to the __init__ method of dataclasses
* Only occurs when you *subclass* a dataclass defined in another module.

My tests are in these two files on my cpython fork:

* 
https://github.com/AlexWaygood/cpython/blob/forward-annotations-bpo-45524/Lib/test/test_future_annotations.py
* 
https://github.com/AlexWaygood/cpython/blob/forward-annotations-bpo-45524/Lib/test/_typing_imports_helper.py

(I'm not proposing adding two new files to the cpython test suite -- just put 
the tests in new files so that I could isolate the new tests from the rest of 
the test suite and understand the problem better.)

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45524>
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