rem: return this.toArray().join(' '); 
add: return this.expression; 
context:   toString: function() {    return this.toArray().join(' ');  }
meta: 2019	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2019/cb20644c026e010b58d134c622b7dd70eddae16a/prototype.js/buggy/phpmyfaq/inc/js/prototype.js