Method allocatorWait

Tests/Libraries/Await/AwaitTest.cpp:1497–1501

    static AwaitTask waitForCompletedChild(AwaitEventLoop& await)
    {
        AwaitTask child = waitTwice(await);
        SC_CO_TRY(await.spawn(child));

        AwaitTimeoutResult timeoutResult;
        SC_CO_TRY(co_await await.waitFor(child, 100_ms, &timeoutResult));
        if (timeoutResult.timedOut)
        {
            co_return Result::Error("Await waitFor completed child timed out");