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 if (typeof TypedObject === 'undefined')

     quit();

 var StructType = TypedObject.StructType;

 var uint8 = TypedObject.uint8;

 function check(c) {

   assertEq(c.r, 129);

 }

 function run() {

   var RgbColor = new StructType({r: uint8, g: uint8, b: uint8});

   var Fade = new StructType({from: RgbColor, to: RgbColor});

   var BrgColor = new StructType({b: uint8, r: uint8, g: uint8});

   var BrgFade = new StructType({from: BrgColor, to: BrgColor});

   var gray = new RgbColor({r: 129, g: 128, b: 127});

   var fade = new Fade({from: gray, to: gray});

   fade.to = {r: 129, g: 128, b: 127};

   var brgGray = new BrgColor(gray);

   fade.from = brgGray;

   var brgFade = new BrgFade(fade);

   check(fade.to);

   check(brgFade.to);

   check(fade.to);

   check(brgFade.to);

 }

 run();