[Haskell-cafe] Re: change in overlapping instance behavior between GHC 6.12 and GHC 7 causes compilation failure

What changed between GHC 6.12 and GHC 7.0? Is there a some solution besides using IncoherentInstances in every module that imports XMLGenerator?

I just want to point out that IncoherentInstances is NOT a solution. It would probably make the files compile, but not at all with the semantics we want. /Niklas