anchor.diff:  
   buildGoPackage rec {
     name = "terraform-${version}";
  -  version = "0.7.2";
  +  version = "0.7.4";
     rev = "v${version}";
   
     goPackagePath = "github.com/hashicorp/terraform";
  
positive.code:     description = "Tool for building, changing, and versioning infrastructure";
      homepage = "https://www.terraform.io/";
      license = licenses.mpl20;
    };
  }
  
negative.code:     inherit rev;
      owner = "hashicorp";
      repo = "terraform";
      sha256 = "1mj9kk9awhfv717xf9d8nc35xva8wqhbgls7cbgycg550cc2hf85";
    };
  
    postInstall = ''
  