michael@0: var total = 0
michael@0: 
michael@0: x = [ [] ]
michael@0: x[0].valueOf = function () {
michael@0:   total++;
michael@0: }
michael@0: function f(y) {
michael@0:     y != Math.abs()
michael@0: }
michael@0: (function() {
michael@0:     f()
michael@0:     f(x[0])
michael@0:     f(x[0])
michael@0: })()
michael@0: 
michael@0: assertEq(total, 2)