michael@0: // for-of can be used to iterate over a Set twice.
michael@0: 
michael@0: var set = Set(['a', 'b', 'c']);
michael@0: var log = '';
michael@0: 
michael@0: for (let i = 0; i < 2; i++) {
michael@0:     for (let x of set)
michael@0:         log += x;
michael@0:     log += ';'
michael@0: }
michael@0: assertEq(log, 'abc;abc;');