michael@0: function testSetProtoRegeneratesObjectShape()
michael@0: {
michael@0:   var f = function() {};
michael@0:   var g = function() {};
michael@0:   g.prototype.__proto__ = {};
michael@0: 
michael@0:   function iq(obj)
michael@0:   {
michael@0:     for (var i = 0; i < 10; ++i)
michael@0:       "" + obj.prototype;
michael@0:   }
michael@0: 
michael@0:   iq(f);
michael@0:   iq(f);
michael@0:   iq(f);
michael@0:   iq(f);
michael@0:   iq(g);
michael@0: 
michael@0:   if (shapeOf(f.prototype) === shapeOf(g.prototype))
michael@0:     return "object shapes same after proto of one is changed";
michael@0: 
michael@0:   return true;
michael@0: }
michael@0: assertEq(testSetProtoRegeneratesObjectShape(), true);