tests: coroutines_test: add reproducers for #1913 #2187
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again even if the previous returned
yield_awaiter
is not ready, and that not-ready awaiter has not been resumed. another problem is that, the awaiter in generator coroutine fails to keep the async buffer alive when caller of async generator either drains the generator or returns without draining the generator. either way, some test cases are added in this test for two purposes:Refs #1913