michael@0: // Don't assert.
michael@0: function f0() {
michael@0:     var v0;
michael@0:     var v1;
michael@0:     while (v1) {
michael@0:         v1 = v0 + v1;
michael@0:         v0 = v1 + v1;
michael@0:     }
michael@0:     return v0;
michael@0: }
michael@0: assertEq(f0(), undefined);