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23
24description(
25"Tests that a convert_this optimized for the case where this is an object with polymorphic structure behaves correctly when you then pass null."
26);
27
28function foo() {
29    return this.x;
30}
31
32x = 42;
33
34for (var i = 0; i < 1000; ++i) {
35    var me;
36    if (i < 150)
37        me = this;
38    else if (i < 950)
39        me = {x:42, y:62};
40    else
41        me = null;
42    shouldBe("foo.call(me)", "42");
43}
44