i am working on improving a module for getting Yahoo Finance quote data, hopefully getting it to a point that i can put it on hackage in the quote retrieval function, there are a few places i would like to call out errors. in a trivial case i could return IO (Maybe String) with Nothing signifying any error state, or Just expressing the data but i would like to be able to express some of these error cases in a more structured manner i know the Either type can be used in such a case(?), but i've had some problem locating a satisfactory example (if this is indeed appropriate) could one of the vets here provide a simplistic example expressing error cases, preferrably in the IO Monad (in case there are any gotchas there)? thanks so much! brad