2008/5/1 Galchin, Vasili <[EMAIL PROTECTED]>: > 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 ........ > _ -> ......... > > ?? >
Sure, after pattern-matching on the x (using a case, or a top-level pattern match), you are free to use x in the resulting branch. For example: bonzo (Just (Bozo x)) = print (show x) >> return x -- or whatever bonzo Nothing = return () -Brent
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