Doesn't error-kit do this?
On Wed, Mar 11, 2009 at 10:15 PM, Mark Engelberg
wrote:
>
> I'm thinking about implementing a backtracking mechanism that throws
> errors as a way to escape out of the current computation and try
> another possibility. I'd want to create a specific error to escape,
> and the backtracking mechanism should only catch this very specific
> error.
>
> Now, I vaguely recall some thread on here a while ago about how this
> is very hard to do in Clojure, because Clojure wraps the errors inside
> of other errors as they work their way outwards, so you can't just
> catch a very specific error. I think there was some sort of
> workaround involving catching every error, and looking deep inside the
> stack of errors to find the specific error, and if not found, pass it
> on up the chain.
>
> Am I remembering this "gotcha" correctly? If so, can someone please
> spell out the workaround for me again?
>
> Thanks.
>
> >
>
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