rem: return c === " " || c === "\n" || c === "\t"; 
add: return c === " " || c === "\r" || c === "\n" || c === "\t" || c === "\f"; 
context:     function isWhitespace(c) {	return c === " " || c === "\n" || c === "\t";    };
meta: 4636	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4636/0bc8f13bad18ef0f992ba2b90f387c220c907455/runtime.js/buggy/scheme2js/runtime/runtime.js