[IronPython] Error on startup of IronPython 2.6 RC with certain command line options

[Michael Foord]

On Win 7 with 2.6 RC1 installed:

C:\compile>"c:\Program Files\IronPython 2.6\ipy.exe" -D -X:FullFrames 
-X:Tracing  -X:TabCompletion
Traceback (most recent call last):
  File "c:\Program Files\IronPython 2.6\Lib\site.py", line 62, in 
c:\Program Files\IronPython 2.6\Lib\site.py
  File "c:\Program Files\IronPython 2.6\Lib\os.py", line 63, in 
c:\Program Files\IronPython 2.6\Lib\os.py
  File "c:\Program Files\IronPython 2.6\Lib\ntpath.py", line 12, in 
c:\Program Files\IronPython 2.6\Lib\ntpath.py
  File "c:\Program Files\IronPython 2.6\Lib\warnings.py", line 8, in 
c:\ProgramFiles\IronPython 2.6\Lib\warnings.py
  File "c:\Program Files\IronPython 2.6\Lib\types.py", line 53, in 
c:\Program Files\IronPython 2.6\Lib\types.py
SystemError: Object reference not set to an instance of an 
object.IronPython 2.6
 (2.6.10920.0) on .NET 2.0.50727.4927
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