Remove some unused variables, properties and methods

Author: tgalopin

Parser/TokenStream.php

@@ -29,11 +29,6 @@ class TokenStream
      */
     private $tokens = array();
 
-    /**
-     * @var bool
-     */
-    private $frozen = false;
-
     /**
      * @var Token[]
      */
@@ -47,7 +42,7 @@ class TokenStream
     /**
      * @var Token|null
      */
-    private $peeked = null;
+    private $peeked;
 
     /**
      * @var bool
@@ -73,8 +68,6 @@ public function push(Token $token)
      */
     public function freeze()
     {
-        $this->frozen = true;
-
         return $this;
     }