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In the interest of getting something landed for 3.7, so we can start using it in tests, I'm putting up a patch for a low-level interpreters module. In some ways this is a precursor for issue #30439, which will add a proper public stdlib module in 3.8.
The module I'm adding draws from the ideas in PEP 554 (particularly for channels). Consequently, this will also give us an opportunity to try out some of the semantics from the PEP to give us better ideas for 3.8.
I expect to have some follow-on patches to facilitate simpler use in tests. This patch is big enough already. :)