防止 awaitable_detached 在 完全 detach 模式下吞异常 #39
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awaitable_detached 的 await_resume 只有被 co_await 下才会调用。其存储的异常才可以被重新抛出。
如果没被 co_await, 则其存储的异常就彻底被吞没了。
重抛之以解决吞没问题