[Haskell-cafe] Automatic derivation (TemplateHaskell?)
joelr1 at gmail.com
Thu Apr 5 11:14:05 EDT 2007
Shouldn't this work just as well?
choice [ try $ float >>= return . Num
, integer >>= return . Int
It works on "Foo(10.345)" but not on "Bar(10, 103.34)".
On Apr 5, 2007, at 4:09 PM, Stefan O'Rear wrote:
>> numExpr :: GenParser Char a NumExpr
>> numExpr = do sg <- lexeme sign
>> nf <- natOrFloat
>> return $ either (Int . sg) (Nat . sg) nf
> It seems silly that there is no signed version of natOrFloat
> predefined, any Parsec experts?
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