michael@0: String.prototype.m = function(s) {
michael@0:     return this.indexOf('a');
michael@0: };
michael@0: 
michael@0: var g = function(s) {
michael@0:     return (s + 'asdf').m();
michael@0: };
michael@0: 
michael@0: var h = function(s) {
michael@0:     return ('asdf' + s).m();
michael@0: };
michael@0: 
michael@0: var ix = g(new String('abc'));
michael@0: assertEq(ix, 0);
michael@0: 
michael@0: var ix = h(new String('abc'));
michael@0: assertEq(ix, 0);