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function f(o, n) {
if (n) {
o[n] = true;
} else {
o.x = true;
}
}
// Warm up object so HadElementsAccess check will trip next
var o = {};
for (var i = 0; i < 43; ++i) {
o["x" + i] = true;
}
f(o, "y");