anchor.diff:  
   buildGoPackage rec {
     name = "peco-${version}";
  -  version = "0.5.2";
  +  version = "0.5.3";
   
     goPackagePath = "github.com/peco/peco";
     subPackages = [ "cmd/peco" ];
  
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:     owner = "peco";
      repo = "peco";
      rev = "v${version}";
      sha256 = "1m3s1jrrhqccgg3frfnq6iprwwi97j13wksckpcyrg51z6y5q041";
    };
  
    goDeps = ./deps.nix;
  