[issue43478] Disallow Mock spec arguments from being Mocks

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

The tests can be fixed. The change to raise exception can be merged to gather feedback during alpha/beta and see if there are any valid usecases.

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<https://bugs.python.org/issue43478>
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