STINNER Victor <vstin...@python.org> added the comment:

> Or even fatal error out?  There's no reason to have Py_TPFLAGS_HAVE_GC but 
> not implement tp_traverse, AFAIR.

Well... It would prefer a smooth transition.

Such sanity checks which mostly concerns developers perfectly fit the -X dev 
mode.

I mean, calling Py_FatalError() only in development mode would be acceptable, 
rather than blocking the usage of C extensions which are working "perfectly 
well" on Python 3.7.

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<https://bugs.python.org/issue38006>
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