[IronPython] 'Cannot evaluate expression because the code of the current method is optimized.' when debugging IronPython 2.6

[Jeff Hardy]

Hi,
When debugging Python code with Visual Studio, I'm getting 'Cannot
evaluate expression because the code of the current method is
optimized.' for just about everything when trying to inspect Python
objects, even when running with -X:Debug. This is with IronPython 2.6.

I remember this working at some point in the past, so I'm wondering if
there is something else I need to do (like a different -X: switch) to
be able to view the values on those objects.

- Jeff