[issue28629] Emit ResourceWarning when implicitly terminating a suspended frame?

[Nick Coghlan]

Nick Coghlan added the comment:

Oops, I forgot to mention one other potential cost-minimisation strategy for a `co_cleanuptab` field: only populate it with setup/cleanup opcode pairs that include a yield, yield from, or await operation between them. 

The potential benefit I can see to *not* doing that is that if the information is always available (even on synchronous frames), then greenlet based frameworks like gevent may be able to make use of it.

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<http://bugs.python.org/issue28629>
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