Tue Mar 12 09:08:34 EDT 2019

cabal2nix, remarks

- it seems to work well in general, but expect some inconsistencies in
  nixpkgs for obscure things.  (e.g. llvm-hs didn't have correc tllvm version)

 it seems best to just standardize on a global
  nixpkgs, and fix haskell module version conflicts in 


- set up some kind of cache for local nixpkgs builds.