anchor.diff:     ast-tree))
   
   (defun match-end (tokenizer) 
  -  (match (advanze-token tokenizer) ";"))
  +  (match-adv tokenizer ";"))
   
   (defun parse-file (tokenizer ast-tree)
     (parse-usings tokenizer ast-tree)
  -  );;(parse-class tokenizer ast-tree))
  +  (parse-class tokenizer ast-tree))
   
   (defun parse-usings (tokenizer ast-tree)
     (let ((ast-node (parse-using tokenizer)))
  
positive.code: Imports = Using & Using
  Import = 'using' String stmtEnd 
  stmtEnd = ';' 
  
  Class = ClassDeclaration ( ClassParameters ) : ClassBody
  ClassDeclaration = 'partial'? 'public'? class String
  ClassParameters = VariableDeclaration | VariableDeclaration , ClassParameters
  VaribleDeclaration = Type String
  Type = int | string | bool
  
  
negative.code: 
  (defun match (token symbol)
    (string= token symbol))
  
  (defun match-adv (tokenizer symbol)
    (match (advanze-token tokenizer) symbol))
  
  (defun parse-csharp (tokenizer)
    (let ((ast-tree (list(make-ast-node :file "name"))))
  