Pytest fails on Windows about pennylane-lightning HOT 3 CLOSED

Nice catch @chaeyeunpark! Although I wonder why the automatic tests that are being run by cibuildwheel after the Windows wheel is created isn't catching this?

As this only a few people use Pennylane on Windows and this is almost nothing to do with a user code, I don't think this is an urgent issue.

Could a user have the same issue if they repeat the same code that is written in the tests? Or are the tests explicitly setting complex256 as a test case?

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Hi @josh146! Thanks for the comments/questions. Currently, our GitHub action only runs pl-device-test not the whole pytest.

In addition, the errors are raised only because there is no attribute named complex256 in numpy on Windows as it is just an alias defined in Linux (https://numpy.org/doc/stable/reference/arrays.scalars.html#numpy.clongdouble). 256 bit complex numbers are not supported by lightning even in Linux environments.

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I think we can remove the complex256 from checks/tests. No long-term hardware support exists on any platform, and as reported the tooling only supports this on Linux.

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