On Dec 19, 5:14 pm, Michael Snoyman
Well, here's one way of doing it. You have lots of choices here; these are the decisions I made in implementing the code:
* myFuncB no longer lives in the IO monad. I wasn't sure if you specifically wanted that, but now it can work with *any* instance of Failure. * Since I assumed you ultimately wanted it to land in the IO monad, I defined Exception instances. However, if you were dealing with a different Failure instance (like [] or Maybe), these would be unncesary. * I also assume that what you meant by "your code" and "their code" is that you can modify your own code, but not theirs.
If you show me what the real code is you're working on, I'd be happy to more fully develop a better solution with you. Anyway, here's the code.
Thank you very much. This helped a lot. I wasn't aware of many of the details you showed me now, such as deriving from Typeable. The assumptions you have made w.r.t to what I want to write all make sense and I guess I can experiment with Control.Failure a little better now. Thanks again, nt