A nixpkgs overlay for the haskell-primitive ecosystem.

An example where you can enter a shell suitable for hacking on vector with the overlay:

# shell.nix

let
  pkgs = import <nixpkgs> {};
  overrides = import (pkgs.fetchFromGitHub {
    owner = "haskell-primitive";
    repo = "primitive-overlay";
    rev = "...";
    sha256 = "...";
  }) { hlib = pkgs.haskell.lib; fetchFromGitHub = pkgs.fetchFromGitHub };
  hPkgs = pkgs.haskell.packages.ghc865.override { inherit overrides; };
in hPkgs.shellFor {
  packages = ps: with ps; [ vector ];
}