[Haskell-cafe] Re: How to catch error in array index when
Colin Paul Adams
colin at colina.demon.co.uk
Sun Mar 15 05:08:07 EDT 2009
>>>>> "Peter" == Peter Hercek <phercek at gmail.com> writes:
Peter> Colin Paul Adams wrote:
>>>>>>> "Adrian" == Adrian Neumann <aneumann at inf.fu-berlin.de>
Adrian> You can use the ghci debugger
Adrian> it can set breakpoints on exceptions.
>> So i tried adding the -fbreak-on-error flag. It made no
>> difference - it still exited:
>> <interactive>: Error in array index <interactive>: interrupted
>> <interactive>: warning: too many hs_exit()s
Peter> IIRC, this is because you are catching exceptions at some
Peter> higher level where you actually find out that this kind of
Peter> an exception is not handled and give up. If your
Peter> application is Gtk2Hs then this library will do the
Peter> catching you do not like in this case. Try to use
That is the case.
Peter> -fbreak-on-exception instead of -fbreak-on-error. If you
Peter> try this you may need to set break-on-exception late enough
Peter> in the execution (use some breakpoint) so that you are not
Peter> stopping at places which are ok (are correctly handled in
Peter> an exception handler).
This works - in conhunction with :trace and :history. Thanks.
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