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// A Map iterator does not iterate over new entries added after it throws StopIteration.
load(libdir + "iteration.js");
var map = new Map();
var iter0 = map[Symbol.iterator](), iter1 = map[Symbol.iterator]();
assertIteratorDone(iter0, undefined); // closes iter0
map.set(1, 2);
assertIteratorDone(iter0, undefined); // already closed
assertIteratorNext(iter1, [1, 2]); // was not yet closed
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