Haskell.nix

haskell.nix is a haskell build infrastructure for nix. Nix provides reproducable builds, and haskell.nix provides the cabal/stack glue code to make nix aware of haskell projects. We use this to great success, and the tools team keeps improving and maintaining it. Part of the work the tools team does includes figuring out how to make ghc and cabal more friendly towards nix, such that we can reduce the complexity that is in haskell.nix.