Haskell overlapping instances and type functions?

It's illegal to have overlapping instances with type families. See the GHC manual Overlap of type synonym instances" for details.

It's illegal to have overlapping instances with type families. See the GHC manual, "Overlap of type synonym instances" for details. The reason is that having two different possible results for a type function application depending on the available instances can lead to unsoundness.

– Giuseppe Maggiore Dec 17 '10 at 8:11 I can't think of any workarounds apart from exhausting all cases. Sorry! – Ganesh Sittampalam Dec 17 '10 at 10:00.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.