[issue46170] Improving the error message when subclassing NewType

[Nikita Sobolev]

Nikita Sobolev <mail at sobolevn.me> added the comment:

Turns out modern docs already have this problem fixed: https://docs.python.org/3/library/typing.html#newtype

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46170>
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