2008/5/2 Galchin, Vasili <[EMAIL PROTECTED]>:
>
> data Bozo =
> Bozo {
> id :: Int
> }
>
> bonzo :: Maybe Bozo -> IO ()
> bonzo maybe_bozo = do
> if maybe_bozo == (Just (Bozo x))
> then
> return ()
> else
> return ()
bonzo maybe_bozo =
case maybe_bozo of
Just (Bozo x) -> return ()
_ -> return ()
Or equivalently:
bonzo (Just (Bozo x)) = return ()
bonzo _ = return ()
You should watch out for your use of id as a field name, since id is a
builtin function and you will get ambiguity errors.
Luke
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