* Christian Maeder
Hi,
the following code goes through parsec-2 (and parsec1) but is rejected by parsec-3
import Text.ParserCombinators.Parsec gqrrel = many1 (alphaNum <|> char '_') myparser = sepBy gqrrel (char ',')
The error message is:
No instance for (parsec-3.1.1:Text.Parsec.Prim.Stream s m Char) arising from a use of `char' at P3.hs:3:25-32 Possible fix: add an instance declaration for (parsec-3.1.1:Text.Parsec.Prim.Stream s m Char) In the second argument of `sepBy', namely `(char ',')' In the expression: sepBy gqrrel (char ',') In the definition of `myparser': myparser = sepBy gqrrel (char ',')
Works just fine here. % cat psc.hs import Text.ParserCombinators.Parsec gqrrel = many1 (alphaNum <|> char '_') myparser = sepBy gqrrel (char ',') % ghci -package parsec-3.1.0 psc.hs GHCi, version 6.12.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package bytestring-0.9.1.5 ... linking ... done. Loading package mtl-1.1.0.2 ... linking ... done. Loading package syb-0.1.0.2 ... linking ... done. Loading package parsec-3.1.0 ... linking ... done. [1 of 1] Compiling Main ( psc.hs, interpreted ) Ok, modules loaded: Main. *Main> :t myparser myparser :: (Text.Parsec.Prim.Stream s m Char) => Text.Parsec.Prim.ParsecT s u m [[Char]] -- Roman I. Cheplyaka :: http://ro-che.info/ Don't worry what people think, they don't do it very often.