Re: ANN: Overlay Hackage Package Index for GHC HEAD

Matthew Pickering writes:

Something like this is definitely useful for testing.

When building GHC HEAD I override the ghcHEAD derivation on nixpkgs to the right commit I want to use and then can similarly specify which patches and versions of packages to use by modifying the 'configuration-ghc-head.nix' file. This is quite a bit more flexible than just patch files as I can point to specific commits in git repos etc.

This sounds amazing. I think you may have finally sold me on Nix.