How to clone Boost ASIO coroutine on fork?

Looking at the Boost ASIO http server example with coroutines I am wondering if the used cloning method is safe:

    // We "fork" by cloning a new server coroutine to handle the connection.
    // After forking we have a parent coroutine and a child coroutine. Both
    // parent and child continue execution at the following line. They can
    // be distinguished using the functions coroutine::is_parent() and
    // coroutine::is_child().
    fork server(*this)();

With that line a server object is copy constructed from the current object.

But isn't there the possibility that following happens:

the cloned child coroutine issues a yield

thus, the child's coroutine body is left

thus, the child's operator()() method is left

the parent destructs the child object

the parent starts a new iteration and yields

an async-method called by the child finishes

thus, the now (destructed) child coroutine is reentered

If it is safe, why?

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