[issue4242] Classify language vs. impl-detail tests, step 1

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Would a C API in CPython to set the value returned by sys.vm be enough
to help Cython out Stefan?

Such a feature would help with any CPython based variant - the
implementers could either leave sys.vm as "cpython" and attempt to be
fully compatible, or else set it to something different (e.g "stackless"
or "cython") and target the common subset of the test suite.

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