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