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// A Set iterator does not iterate over new entries added after it throws StopIteration.
load(libdir + "iteration.js");
var set = new Set();
var iter0 = set[Symbol.iterator](), iter1 = set[Symbol.iterator]();
assertIteratorDone(iter0, undefined); // closes iter0
set.add("x");
assertIteratorDone(iter0, undefined); // already closed
assertIteratorNext(iter1, "x"); // was not yet closed
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