I'm trying to wrap this struct, CvDTreeSplit. Normally I just use swig to wrap 
them but in this case when I wrap the C++ struct, CvDTreeSplit, below, I get 
this error in swig:

 Warning 312: Nested union not currently supported (ignored).

So the output ends up being the defcstruct at the bottom of the page.  Not sure 
where to go from here. Can someone wrap this struct for me so I'll know how to 
wrap structs, with nested unions, containing structs and C arrays, in the 
future.


struct CvDTreeSplit
{
    int var_idx;
    int condensed_idx;
    int inversed;
    float quality;
    CvDTreeSplit* next;
    union
    {
        int subset[2];
        struct
        {
            float c;
            int split_point;
        }
        ord;
    };
};

(cffi:defcstruct CvDTreeSplit
    (var_idx :int)
    (condensed_idx :int)
    (inversed :int)
    (quality :float)
    (next :pointer))
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