[IronPython] Mutex creation wierdness

[Brian Quinlan]

Sorry if I'm posting problems that everyone knows about but:

 >>> from System.Threading import Mutex
 >>> m = Mutex(False, "Hello")
Traceback (most recent call last):
   File , line 0, in input##5
NotImplementedError: generate:  type: System.DBNull
 >>> m = Mutex()
Traceback (most recent call last):
   File , line 0, in input##34
NotImplementedError: generate:  type: System.DBNull

Cheers,
Brian