import std.stdio;

struct FOO
{
    uint x;
    uint y;

    struct BAR
    {
        ulong z;        
        union 
        {
            struct
            {
                uint a;
                uint b;
            }
            
            struct
            {
                ulong c;
            }
        }
    }
}

int main(char[][] args)
{
	writefln("FOO.sizeof = %d (should be 24)", FOO.sizeof);
  writefln("FOO.BAR.sizeof = %d", FOO.BAR.sizeof);
	return 0;
}