On 2015-10-05 at 15:57:39 +0200, Erik Hesselink wrote:
Does anyone here use base-compat? It has worked quite well in my very limited usage. I think that if the libraries committee officially maintained it then most of the complaints about the difficulties of maintaining backwards-compatible code and having to use conditional compilation would go away. So we have a solution for a large subset of the complaints here, why is nobody using it?
We use base-compat, and it works for addition of functions and instances. It doesn't work for type class changes like this one.
Btw, this is exactly why GHC 7.10 droped support for the `haskell2010` library package. See also https://ghc.haskell.org/ticket/9590 for more details about that (and some ideas how to recover a `haskell2010` package in future GHC versions albeit with some tradeoffs). Cheers, hvr