michael@0: var log;
michael@0: function b(x) { log += 'b'; return 'B'; }
michael@0: function g() {
michael@0:     log = '';
michael@0:     var a = {toString: function () { log += 'a'; return 'A'; }};
michael@0:     assertEq("[" + a + b() + "]", "[AB]");
michael@0:     assertEq(log, "ab");
michael@0: }
michael@0: 
michael@0: for (var i = 0; i < 1000; ++i)
michael@0:     g();
michael@0: