[IronPython] Can't get asynchronous delegates to work

[Knic Knic]

I am trying to get asynchronous delegates to work in 1.1.2 and 2.0 beta3,
both fail for me, here is what I am trying to do

from IronPython.Runtime.Calls import CallTarget0

def printHi():
 print 'hi'

delegate = CallTarget0(printHi)
async_result = delegate.BeginInvoke(None, None)
delegate.EndInvoke(async_result)

Here is what I get:

Traceback (most recent call last):
  File , line 0, in <stdin>##22
  File , line 0, in EndInvoke##23
SystemError: Object reference not set to an instance of an object.
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