[Haskell-cafe] Minim interpreter

[Hugh Perkins]

Newbie question: why does the following give "Not in scope 'c'" for the last
line?

string :: Parsec.Parser String
string = do c <- Parsec.letter
            do cs <- string
               return c:cs
            Parsec.<|> return [c]

(This is copied more or less rote from
http://legacy.cs.uu.nl/daan/download/parsec/parsec.html , so I'm guessing
there's some sort of command-line option I'm missing?)
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