let
  pkgs = import <nixpkgs> { };
  nmigen-latest = pkgs.python3Packages.nmigen.overrideAttrs(oa: {
    src = pkgs.fetchFromGitHub {
      owner = "m-labs";
      repo = "nmigen";
      rev = "1ad6e3207f02e913407867dddddb8f50fad0ced4";
      sha256 = "14vvw1lcfmcf3374wpn3sslgvgcfg18rkbs8x45vycqag6a5zy0b";
    };
  });
in
 pkgs.mkShell {
    buildInputs = [
      (pkgs.python3.withPackages(ps: [nmigen-latest]))
      pkgs.yosys pkgs.symbiyosys
    ];
  }