Re: [Haskell-cafe] Re: How to catch error in array index when debugging

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"Peter" == Peter Hercek writes:

Peter> Colin Paul Adams wrote: >>>>>>> "Adrian" == Adrian Neumann >>>>>>> writes: >> Adrian> You can use the ghci debugger >> >> >> http://www.haskell.org/ghc/docs/latest/html/users_guide/ghci- Adrian> debugger.html >> 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. -- Colin Adams Preston Lancashire