anchor.diff:      owner = "peco";
       repo = "peco";
       rev = "v${version}";
  -    sha256 = "0cgfwbnz4jp2nvmqf2i03xf69by8g0xgd3k5k9aj46y9hps1ka92";
  +    sha256 = "1m3s1jrrhqccgg3frfnq6iprwwi97j13wksckpcyrg51z6y5q041";
     };
   
     goDeps = ./deps.nix;
  
positive.code:     # peco should work on Windows or other POSIX platforms, but the go package
      # declares only linux and darwin.
      platforms = platforms.linux ++ platforms.darwin;
    };
  }
  
negative.code: 
  buildGoPackage rec {
    name = "peco-${version}";
    version = "0.5.3";
  
    goPackagePath = "github.com/peco/peco";
    subPackages = [ "cmd/peco" ];
  