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>>      local coro -- A forward declaration
>>      coro = coroutine.create(function()
>>        ENGINE.call_me_later(function() assert(coroutine.resume(coro)) end)
>>        coroutine.yield()
>>      end)
>>      assert(coroutine.resume(coro))
>> When I run it, coroutine.resume() inside the callback fails with
>> message "cannot resume running coroutine". Coroutine status is
>> "running" and coroutine.running() points to the coroutine as well.
> It seems like ENGINE.call_me_later() is executing the function that it is
> being passed before returning, so it gets run in the context of the coro
> coroutine itself, which obviously cannot be resumed because it is not
> suspended. I freely admit I may be misunderstanding something here though.

No, I just double checked by adding extensive logging, callback gets
called after whole main chunk is executed.