michael@0: 
michael@0: x = [1,2,3];
michael@0: setObjectMetadata(x, {y:0});
michael@0: assertEq(getObjectMetadata(x).y, 0);
michael@0: 
michael@0: setObjectMetadataCallback(true);
michael@0: 
michael@0: function Foo() {
michael@0:   this.x = 0;
michael@0:   this.y = 1;
michael@0: }
michael@0: 
michael@0: function hello() {
michael@0:   function there() {
michael@0:     w = new Foo();
michael@0:     x = [1,2,3];
michael@0:     y = [2,3,5];
michael@0:     z = {a:0,b:1};
michael@0:   }
michael@0:   callee = there;
michael@0:   callee();
michael@0: }
michael@0: hello();
michael@0: 
michael@0: var wc = getObjectMetadata(w).index;
michael@0: var xc = getObjectMetadata(x).index;
michael@0: var yc = getObjectMetadata(y).index;
michael@0: var zc = getObjectMetadata(z).index;
michael@0: 
michael@0: assertEq(xc > wc, true);
michael@0: assertEq(yc > xc, true);
michael@0: assertEq(zc > yc, true);
michael@0: assertEq(getObjectMetadata(x).stack[0], callee);
michael@0: assertEq(getObjectMetadata(x).stack[1], hello);