michael@0: // Clearing a Set after deleting some entries works.
michael@0: 
michael@0: var s = Set(["a", "b", "c", "d"]);
michael@0: for (var v of s)
michael@0:     if (v !== "c")
michael@0:         s.delete(v);
michael@0: s.clear();
michael@0: assertEq(s.size, 0);
michael@0: assertEq(s.has("c"), false);
michael@0: assertEq(s.has("d"), false);