[issue43478] Disallow Mock spec arguments from being Mocks

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Lets go ahead and try making this a breaking change in 3.10.  If users report it causes a bunch of problems during the beta -that they don't want to address so soon- (they are all likely bugs in test suites...) we can soften it to a warning for a cycle.  My hope is that we won't need to do that.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43478>
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