When compiling this using gmcs and running using mono, using the
daily build 15 9 2007, i am getting an invalid program expcetion.
The issue is in this line:
c[0] += new MyColor (1.0F);

class Testing
{
       public struct MyColor
       {
               float _value;

               public MyColor (float invalue)
               {
                       _value =  invalue;
               }

               static public MyColor operator + (MyColor a, MyColor b)
               {
                       return new MyColor(a._value + b._value);
               }
       }

       static void Main () {
               MyColor[] c = new MyColor [1];
               c[0] += new MyColor (1.0F);
               System.Console.WriteLine("Finnished running to the end");
       }
}