[Haskell-cafe] Extensible Exceptions

[Ross Mellgren]

I think catch is now basically what catchJust was -- you can just do

 > thing_to_try `catch` (\ (ErrorCall s) -> putStrLn s)

and it will only catch ErrorCall exceptions.

-Ross


David F. Place wrote:
> Hi, All.
>
> I am trying to understand the new exceptions package in base-4
> Control.Exceptions.  The documentation for catchJust is the same as in
> Control.OldException including this example:
>
> result <- catchJust errorCalls thing_to_try handler
>
> Control.OldException provides the predicate errorCalls, but the new one
> does not.  I don't see how to write it.
>
> Thanks for reading.
>
> Cheers,
> David
>
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