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// Replacing Array.prototype.iterator with a generator affects for-of behavior.
load(libdir + "iteration.js");
Array.prototype[Symbol.iterator] = function* () {
for (var i = this.length; --i >= 0; )
yield this[i];
};
var s = '';
for (var v of ['a', 'b', 'c', 'd'])
s += v;
assertEq(s, 'dcba');
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