[Haskell-cafe] Extensible Exceptions

[Martin Huschenbett]

BTW, the documentation of catch is bad: the example

    catch (openFile f ReadMode)
        (\e -> hPutStr stderr ("Couldn't open "++f++": " ++ show e))

does not type check. Is this a known "bug" or shall I report it anywhere?

Regards,

Martin.

Ross Mellgren schrieb:
> 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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