what's the proper way to define a COM interface that takes function pointers as arguments?

[Vincent Povirk]

I am trying to define the ICLRRuntimeHost interface.

It has this method:
http://msdn.microsoft.com/en-us/library/ms164410.aspx

One of the arguments is a function pointer type:
http://msdn.microsoft.com/en-us/library/aa964757.aspx

Widl fails when I try to define a function pointer type using C syntax.

So, what's the proper way to do this?

Does widl need to be fixed?