node/deps/v8/test/webkit/dfg-convert-this-polymorphic-object-then-exit-on-other.js

// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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description(
"Tests that a convert_this optimized for the case where this is an object with polymorphic structure behaves correctly when you then pass null."
);

function foo() {
    return this.x;
}

x = 42;

for (var i = 0; i < 1000; ++i) {
    var me;
    if (i < 150)
        me = this;
    else if (i < 950)
        me = {x:42, y:62};
    else
        me = null;
    shouldBe("foo.call(me)", "42");
}