Public Shared Function Fail( _
   ByVal error As Exception, _
   Optional ByVal isErrorHandled As Boolean, _
   Optional ByVal cancelled As Boolean _
) As CoroutineOperation

Dim error As Exception
Dim isErrorHandled As Boolean
Dim cancelled As Boolean
Dim value As CoroutineOperation
 
value = Coroutine.Fail(error, isErrorHandled, cancelled)

public static CoroutineOperation Fail( 
   Exception error,
   bool isErrorHandled,
   bool cancelled
)

public:
static CoroutineOperation^ Fail( 
   Exception^ error,
   bool isErrorHandled,
   bool cancelled
) 

public void SampleCoroutineWithFail() {
  var op = Coroutine.Start(CoroutineWithFail);
  op.Completed += (s, e) => {
    if (e.HasError) {
       MessageBox.Show(e.Error.Message);
    }
  };
}

public IEnumerable<INotifyCompleted> CoroutineWithFail() {
  // Do 1 operation
  yield return _entityManager.Customers.Take(3).ExecuteAsync();
  
  // Let's fail now, why not?
  yield return Coroutine.Fail(new Exception("failed here"), true);

  // This operation will never be run because of the fail above.
  var op2 = _em1.Areas.Take(2).ExecuteAsync();
}