Parsec.Error：ParseError

everyday parser Parsec 
Prelude> :m Text.ParserCombinators.Parsec
Prelude Text.ParserCombinators.Parsec> :i ParseError
data ParseError
  = Text.ParserCombinators.Parsec.Error.ParseError !SourcePos
                                                   [Text.ParserCombinators.Parsec.Error.Message]
        -- Defined in Text.ParserCombinators.Parsec.Error
instance Show ParseError
  -- Defined in Text.ParserCombinators.Parsec.Error