[red-knot] Add failing test for use of type[]
as a base class
#14913
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We support using
typing.Type[]
as a base class (and we have tests for it), but not yetbuiltins.type[]
. At some point we should fix that, but I don't think it';s worth spending much time on now (and it might be easier once we've implemented generics?). This PR just adds a failing test with a TODO.