Parsec.Error：Message

everyday parser Parsec 
Prelude> :m Text.ParserCombinators.Parsec
Prelude Text.ParserCombinators.Parsec> :t Message

<interactive>:1:0: Not in scope: data constructor `Message'
Prelude Text.ParserCombinators.Parsec> :m Text.ParserCombinators.Parsec.Error
Prelude Text.ParserCombinators.Parsec.Error> :i Message data Message
  = SysUnExpect !String
  | UnExpect !String
  | Expect !String
  | Message !String
        -- Defined in Text.ParserCombinators.Parsec.Error
Prelude Text.ParserCombinators.Parsec.Error> :i Message
data Message
  = SysUnExpect !String
  | UnExpect !String
  | Expect !String
  | Message !String
        -- Defined in Text.ParserCombinators.Parsec.Error