rem: return this.toArray().join(' '); 
add: return this.expression; 
context:   toString: function() {    return this.toArray().join(' ');  }
meta: 3974	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3974/af9adbf17404d887f31369756326b0109da7ae2b/prototype.js/buggy/root/static/js/prototype.js