[issue40408] GenericAlias does not support nested type variables

[Ivan Levkivskyi]

Ivan Levkivskyi <levkivskyi at gmail.com> added the comment:

> But this behavior is not specified and is not covered by tests.

FWIW, to be most close to the static type checkers behavior, both D[int][str] and D[int, str] should fail for D = Dict[T, List]. Not important however, since this is a really rare corner case I think.

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<https://bugs.python.org/issue40408>
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