Take following code:

var A = function() {
    this.value = 1;
};
A.prototype.constructor = A;


var B = function() {
    A.call(this);
};
B.prototype = new A();
B.prototype.constructor = B;
var b = new B();
alert(b.value);


If you invoke cc after "b.", then "value" should be in the offered list



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