A CustomYieldInstruction for Unity that just wraps waiting on a task.

WaitOnTask.cs

///<author email="dersyth@gmail.com">Sythelux Rikd</author>
public class WaitOnTask : CustomYieldInstruction
{
    private Task _task;
    private bool _taskDone;

    public override bool keepWaiting => !_taskDone;

    public WaitOnTask(Task task)
    {
        _task = task;
        task.ContinueWith(_ => _taskDone = true);
    }
}