Sorry .. my example was bad. I want to use "x" .. in then branch where it occur ...
e.g. bonzo :: Maybe Bozo -> IO () bonzo maybe_bozo = do case maybe_bozo of Just (Bozo x) -> x ........ _ -> ......... ?? Thanks, V. On Thu, May 1, 2008 at 7:50 PM, Luke Palmer <[EMAIL PROTECTED]> wrote: > 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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