removed some unused variables

lib/parse.js

@@ -304,10 +304,6 @@ function tokenizer($TEXT, filename) {
         return ch;
     };
 
-    function eof() {
-        return !S.peek();
-    };
-
     function find(what, signal_eof) {
         var pos = S.text.indexOf(what, S.pos);
         if (signal_eof && pos == -1) throw EX_EOF;
@@ -909,7 +905,7 @@ function parse($TEXT, options) {
         }
         expect(":");
         S.labels.push(label);
-        var start = S.token, stat = statement();
+        var stat = statement();
         S.labels.pop();
         return new AST_LabeledStatement({ body: stat, label: label });
     };
@@ -1036,7 +1032,7 @@ function parse($TEXT, options) {
 
     var switch_body_ = curry(in_loop, function(){
         expect("{");
-        var a = [], cur = null, branch = null, start = S.token;
+        var a = [], cur = null, branch = null;
         while (!is("punc", "}")) {
             if (is("eof")) unexpected();
             if (is("keyword", "case")) {