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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 a string."
);

function foo() {
    return this.x;
}

x = 42;

String.prototype.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 = "hello";
    shouldBe("foo.call(me)", "42");
}