rem: return ( (r[1].length == 0) ? r[0] : null ); 
add: return ((r[1].length === 0) ? r[0] : null); 
context:     return function (s) {        var r = null;        try {             r = fn.call({}, s );         } catch(e) {             return null;         }        return ( (r[1].length == 0) ? r[0] : null );    };
meta: 1273	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1273/47401e9706fb1f3ab17e4446d15c67ed8e6d530a/parser-debug.js/buggy/src/parser-debug.js