Split into two functions for the optimization to happen

lib/jison.js

@@ -1368,6 +1368,12 @@ function parseError (str, hash) {
 parser.parseError = lrGeneratorMixin.parseError = parseError;
 
 parser.parse = function parse (input) {
+    var args = new Array(arguments.length - 1);
+    for (var i = 0; i < arguments.length - 1; i++) {
+        args[i] = arguments[i + 1];
+    }
+
+var parseInner = function parseInner (input, args) {
     var self = this,
         stack = [0],
         tstack = [], // token stack
@@ -1381,11 +1387,6 @@ parser.parse = function parse (input) {
         TERROR = 2,
         EOF = 1;
 
-    var args = new Array(arguments.length - 1);
-    for (var i = 0; i < arguments.length - 1; i++) {
-      args[i] = arguments[i + 1];
-    }
-
     //this.reductionCount = this.shiftCount = 0;
 
     var lexer = Object.create(this.lexer);
@@ -1607,7 +1608,13 @@ _handle_error:
     }
 
     return true;
-};
+}
+
+  return parseInner.bind(this)(input, args);
+
+}
+
+
 
 parser.init = function parser_init (dict) {
     this.table = dict.table;