ifToken :: TeXParser Token
ifToken =
  (exactToken (ControlSequence "iftrue")) <|>
  (aliasFor AliasIfTrue) <|>
  (exactToken (ControlSequence "iffalse")) <|>
  (aliasFor AliasIfFalse) <|>
  (exactToken (ControlSequence "ifnum")) <?>
  "if token"
ifToken :: TeXParser Token
ifToken =
  (exactToken (ControlSequence "iftrue")) <|>
  (aliasFor AliasIfTrue) <|>
  (exactToken (ControlSequence "iffalse")) <|>
  (aliasFor AliasIfFalse) <|>
  (exactToken (ControlSequence "ifnum")) <?>
  "if token"
ifToken =
  (exactToken (ControlSequence "iftrue")) <|>
  (aliasFor AliasIfTrue) <|>
  (exactToken (ControlSequence "iffalse")) <|>
  (aliasFor AliasIfFalse) <|>
  (exactToken (ControlSequence "ifnum")) <?>
  "if token"