michael@0: function isNegZero(x) {
michael@0:   return x===0 && (1/x)===-Infinity;
michael@0: }
michael@0: 
michael@0: try {
michael@0:     for (y = 0; y < 1; y++) {
michael@0:         x = y;
michael@0:     }
michael@0: } catch (e) {}
michael@0: 
michael@0: function f() {
michael@0:     (x /= -9)
michael@0: }
michael@0: f()
michael@0: assertEq(isNegZero(this.x), true);