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