Consider code like the following:

public Task MyMethodAsync()
{
    using (SomeIDisposable disposable = new SomeIDisposable())
    {
        ...
        return SomethingAsync(disposable); // or fire-and-forget
    }
}

There's a high likelihood that this Task-returning SomethingAsync will be using the SomeIDisposable instance long after it's been disposed. We should consider an analyzer that flags such situations.