yield return AsyncActions.WaitForTask

[bgrainger]

yield return AsyncActions.WaitForTask does not automatically propagate exceptions from the waited-for Task. Although in some cases, the Task is saved in a local variable and its .Result property is accessed (which will throw any saved exceptions), for consistency it seems better to never allow yield return AsyncActions.WaitForTask but instead save the action in a local variable, yield return that, then call .Verify or .Result on the action.