public class Test {
///////////////////////////////////////////////////////////////////////
// Uncomment this to solve the issue
///////////////////////////////////////////////////////////////////////
//    @Suspendable
    interface I {
        void doIt();
    }

    static class C implements I {

        @Override
        @Suspendable
        public void doIt() {
            try {
                Fiber.sleep(10);
            } catch (InterruptedException e) {
                throw new AssertionError(e);
            } catch (SuspendExecution suspendExecution) {
                throw new AssertionError(suspendExecution);
            }
        }
    }

    static public Integer doAll() throws ExecutionException, InterruptedException {
        final I i = new C();

        Fiber<Integer> increasing = new Fiber<>("INCREASER", new SuspendableCallable<Integer>() { @Override public Integer run() throws SuspendExecution, InterruptedException {
            Object o = new Object();
            try {
                i.doIt();
            } finally {
                i.doIt();
                o.toString();
            }
            return 1;
        }}).start();

        return increasing.get();
    }

    static public void main(String[] args) throws ExecutionException, InterruptedException {
        doAll();
    }
}