anchor.diff:  
   declare_spec
       : pragma_declaration
  +    | exception_declaration
       | variable_declaration
       | subtype_declaration
       | cursor_declaration
  -    | exception_declaration
       | type_declaration
       | procedure_spec
       | function_spec
  
positive.code:     ;
  
  package_obj_body
      : variable_declaration
      | subtype_declaration
      | cursor_declaration
      | exception_declaration
      | type_declaration
      | procedure_body
      | function_body
  
negative.code: 
  package_obj_spec
      : pragma_declaration
      | exception_declaration
      | variable_declaration
      | subtype_declaration
      | cursor_declaration
      | type_declaration
      | procedure_spec
      | function_spec
  