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 set = Set("abcd");
michael@0: var iter = set[std_iterator]();
michael@0: var log = "";
michael@0: for (let x of iter) {
michael@0:     log += x;
michael@0:     if (x === "b")
michael@0:         set.delete("c");
michael@0: }
michael@0: assertEq(log, "abd");