michael@0: // A map iterator can cope with removing the next entry.
michael@0: 
michael@0: load(libdir + "iteration.js");
michael@0: 
michael@0: var map = Map([['a', 0], ['b', 1], ['c', 2], ['d', 3]]);
michael@0: var iter = map[std_iterator]();
michael@0: var log = '';
michael@0: for (let [k, v] of iter) {
michael@0:     log += k + v;
michael@0:     if (k === 'b')
michael@0:         map.delete('c');
michael@0: }
michael@0: assertEq(log, 'a0b1d3');