> The change looks good; note, however, that you're doing something
> subtly different if an error occurs: in the original, if an error
> occured then "fail" was used to forcibly terminate the program. Your
> variant however returns the shown error message. Depending on the
> situation, this is u
On 30 September 2010 16:46, C K Kashyap wrote:
>
> Could you please review the change I've done to Don Stewart's
> scripting example -
>
> run s = handle (fail . show) $ do
> (ih,oh,eh,pid) <- runInteractiveCommand s
> so <- hGetContents oh
> se <- hGetContents eh
> hClose ih
> ex <
Thanks Ivan,
>
> * Keep using old-style exceptions. With GHC 6.10 and 6.12, import
> Control.OldException instead of Control.Exception
> * Manually migrate the RWH code to new-style exceptions; there are two
> ways of doing this:
> - For production code, you should add explicit type signatures,
On 30 September 2010 15:23, C K Kashyap wrote:
> Hi,
> I was going over the Error Handling chapter in RWH and tried out this sample -
>
> Prelude> :m Control.Exception
> Prelude Control.Exception> let x=5 `div` 0
> Prelude Control.Exception> let y=5 `div` 1
> Prelude Control.Exception> handle (\_
Hi,
I was going over the Error Handling chapter in RWH and tried out this sample -
Prelude> :m Control.Exception
Prelude Control.Exception> let x=5 `div` 0
Prelude Control.Exception> let y=5 `div` 1
Prelude Control.Exception> handle (\_ -> putStrLn "Text") (print x)
:1:0:
Ambiguous type varia
