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var A = {x: 3};
var B = Object.create(A);
var C = Object.create(B);
var D = Object.create(C);
function f() {
for (var i=0; i<30; i++) {
assertEq(D.x, (i <= 20) ? 3 : 10);
if (i === 20) {
C.__proto__ = {x: 10};
}
}
}
f();