Re: [Haskell-cafe] Extensible Exceptions

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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