Re: Overlapping instances vs. Haskell98 Report [was: How to disable warning for "export item 'module ...' exports nothing"?]

Sean Leather wrote:

That's interesting. So, maybe there should be some language extension or warning (with associated -fno-warn) for this in GHC.

Personally, I prefer the way it's done now. (I guess that's obvious, considering I'm developing a library that will take advantage of it. ;) ) But it makes sense that instances are only looked up when needed, instead of globally tracked.

see: http://hackage.haskell.org/trac/ghc/ticket/2356