problem z pasec

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#918

From: lowik86
Date: Wed, 08 Aug 2007 12:01

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ze strony http://legacy.cs.uu.nl/daan/download/parsec/parsec.html 
wrzucilem taki kawalek kodu:

price   :: Parser Int   -- price in cents
price   = lexeme (do{ ds1 <- many1 digit
                     ; char '.'
                     ; ds2 <- count 2 digit
                     ; return (convert 0 (ds1 ++ ds2))
                     })
           <?> "price"
           where
             convert n []     = n
             convert n (d:ds) = convert (10*n + digitToInt d) ds

i wywala mi blad : Variable not in scope: 'digitToInt'
co robie nie tak?
musza importowac jakis modul?ale jakie?z gory dzieki

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From: "lowik86@onet.eu" <lowik86@onet.eu>
Newsgroups: pl.comp.lang.funkcyjne
Subject: problem z pasec
Date: Wed, 08 Aug 2007 14:01:29 +0200
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