There is flexible exception handling in Haskell?

[7253146 at informatica.alumnos.uma.es]

Hi all. I am porting to Haskell a small zlib-based library for .zip files (I 
have not seen any released package for it, although it should very useful). The 
matters come when I try to address exceptional conditions: all the library 
functions return a integer code with OK/SOMEERROR meaning. The most natural way 
to carry the exceptional situations should be raise IO exceptions, but here 
comes the problem: how can I define new Exception codes, instead of raising 
userError all the time? I think it makes sense for a library to raise 
specialized exceptions, instead of userErrors.

There is such a mechanism? Can someone help?

Thanks.



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