anchor.diff:    | ASSERT
     | AND
     | AMP
  -  | ABSTRACT
   type tokenId = 
       | TOKEN_WITH
       | TOKEN_WHEN
  
positive.code:     | TOKEN_ASSERT
      | TOKEN_AND
      | TOKEN_AMP
      | TOKEN_ABSTRACT
      | TOKEN_end_of_input
      | TOKEN_error
  type nonTerminalId = 
  
negative.code:     | TOKEN_PRAGMA_PUSH_OPTIONS
      | TOKEN_PRAGMA_POP_OPTIONS
      | TOKEN_PRAGMALIGHT
      | TOKEN_POLYMONADIC_SUBCOMP
      | TOKEN_POLYMONADIC_BIND
      | TOKEN_PIPE_RIGHT
      | TOKEN_PERCENT_LBRACK
  