rem: return s.charAt(k); 
add: return new sc_Char(s.charAt(k)); 
context: function sc_stringRef_immutable(s, k) { /// export    return s.charAt(k);}
meta: 4636	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4636/69077bec30b85c2868c6d201c5ad659fdf97944f/runtime.js/buggy/scheme2js/runtime/runtime.js