enum Token {
  SHL = 257, // Parser generators reserve 0-256 for char literals
  SHR,
  LE,
  EQEQ,
  NE,
  GE,
  ANDAND,
  OROR,
  SHLEQ,
  SHREQ,
  MINUSEQ,
  ANDEQ,
  OREQ,
  PLUSEQ,
  STAREQ,
  SLASHEQ,
  CARETEQ,
  PERCENTEQ,
  DOTDOT,
  DOTDOTDOT,
  MOD_SEP,
  LARROW,
  RARROW,
  FAT_ARROW,
  LIT_BYTE,
  LIT_CHAR,
  LIT_INTEGER,
  LIT_FLOAT,
  LIT_STR,
  LIT_STR_RAW,
  LIT_BYTE_STR,
  LIT_BYTE_STR_RAW,
  IDENT,
  UNDERSCORE,
  LIFETIME,

  // keywords
  SELF,
  STATIC,
  ABSTRACT,
  ALIGNOF,
  AS,
  BECOME,
  BREAK,
  CATCH,
  CRATE,
  DEFAULT,
  DO,
  ELSE,
  ENUM,
  EXTERN,
  FALSE,
  FINAL,
  FN,
  FOR,
  IF,
  IMPL,
  IN,
  LET,
  LOOP,
  MACRO,
  MATCH,
  MOD,
  MOVE,
  MUT,
  OFFSETOF,
  OVERRIDE,
  PRIV,
  PUB,
  PURE,
  REF,
  RETURN,
  SIZEOF,
  STRUCT,
  SUPER,
  UNION,
  TRUE,
  TRAIT,
  TYPE,
  UNSAFE,
  UNSIZED,
  USE,
  VIRTUAL,
  WHILE,
  YIELD,
  CONTINUE,
  PROC,
  BOX,
  CONST,
  WHERE,
  TYPEOF,
  INNER_DOC_COMMENT,
  OUTER_DOC_COMMENT,

  SHEBANG,
  SHEBANG_LINE,
  STATIC_LIFETIME
};