anchor.diff:   ;
   
   view_name 
  - : any_name
  - ;
  -
  -module_name 
    : any_name
    ;
   
  
positive.code: 
  error_message
   : STRING_LITERAL
   ;
  
  module_argument // TODO check what exactly is permitted here
   : expr
   | column_def
   ;
  
  column_alias
  
negative.code:  | K_VACUUM
   | K_VALUES
   | K_VIEW
   | K_WHEN
   | K_WHERE
   | K_WITH
  