[Haskell-cafe] Extensible Exceptions
rmm-haskell at z.odi.ac
Fri Nov 21 20:30:07 EST 2008
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.
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.
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