rem: return { toString : function() { alert(1); } }; }); 
add: return { toString : function() { alert(1); } }; }); 
context:   document.watch("title", function(a,b,c,d) {    return { toString : function() { alert(1); } };  });
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/0b675418ba636127763e94e614e62364d6caa659/regress-361964.js/buggy/js/tests/js1_5/extensions/regress-361964.js