anchor.diff:      | continue_statement
       ;
   
  +call_statement
  +    : method_call
  +    | access method_access
  +    ;
  +
   iterative_statement
       : repeat_statement
       | foreach_statement
  
positive.code:     ;
  
  variable_declaration
      : type=data_type  decl+=declarator (',' decl+=declarator)
      ;
  
  declarator
  
negative.code:     ;
  
  statement
      : call_statement
      | assignment_expression
      | variable_declaration
      | if_statement
  