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function g(o, idx, exp) {
for (var i=0; i<3000; i++) {
assertEq(o[idx], exp);
}
}
function f() {
var o = [];
for (var i=1; i<100; i++) {
o[-i] = 1;
}
g(o, 50, undefined);
g(o, -50, 1);
}
f();