[Haskell-cafe] More powerful error handling
lemming at henning-thielemann.de
Mon Feb 18 05:58:39 EST 2008
On Sun, 17 Feb 2008, Philippa Cowderoy wrote:
> The nicest use would be for converting between a more specific error type
> and a more general one that handles a wider range of errors - enabling us
> to keep tighter track of which errors are possible in a given piece of
> code. Bonus points for using it together with polymorphic variants where
> rethrow becomes rather trivial.
I guess it's about exception handling, not error handling, right?
I thought that must be possible by plugging various exception types
data CustomException =
| NetworkExc NetworkException
| ThreadExc ThreadingException
Now you can turn any IOError to CustomException by wrapping it with IOExc.
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