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// |reftest| skip-if(!this.hasOwnProperty("Tuple"))
var tupleIndex = -1;
var originalLength = 7;
var obj = {
length: originalLength,
0: 2,
1: 4,
2: 8,
3: 16,
4: 32,
5: 64,
6: 128
};
var tuple = #[2, 4, 8, 16, 32, 64, 128];
function mapFn(value, index) {
tupleIndex++;
assertEq(value, obj[tupleIndex]);
assertEq(index, tupleIndex);
obj[originalLength + tupleIndex] = 2 * tupleIndex + 1;
return obj[tupleIndex];
}
var t = Tuple.from(obj, mapFn);
assertEq(t, tuple);
reportCompare(0, 0);
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