Re: [Haskell-cafe] why 'try' not work in parsec

On Sat, Nov 22, 2008 at 9:46 AM, Changying Li wrote:

Hi. I read 'write yourself a scheme in 48 hours' and try to modify its code. now part of code is :

parseList :: Parser LispVal parseList = liftM List $ sepEndBy parseExpr spaces

<|> do char '(' skipMany space x <- (try parseList) <|> parseDottedList char ')' return x

parseList is succeeding and returning (1); then "char ')'" is failing (because the next character in the input is the '.' -- ryan