anchor.diff:  
     hoon-vim = buildVimPluginFrom2Nix {
       pname = "hoon-vim";
  -    version = "2019-02-19";
  +    version = "2020-02-19";
       src = fetchFromGitHub {
         owner = "urbit";
         repo = "hoon.vim";
  
positive.code: 
    denite-nvim = buildVimPluginFrom2Nix {
      pname = "denite-nvim";
      version = "2020-09-15";
      src = fetchFromGitHub {
        owner = "Shougo";
        repo = "denite.nvim";
        rev = "7d54f44e1035aea4cba99bdb34f0565b55008706";
        sha256 = "1bjslhsw3xm4pvzks7b1v7il8ap2mr7n64sv2sgx56c5fl410pkl";
      };
      meta.homepage = "https://github.com/Shougo/denite.nvim/";
    };
  
negative.code: 
    vim-salve = buildVimPluginFrom2Nix {
      pname = "vim-salve";
      version = "2020-09-22";
      src = fetchFromGitHub {
        owner = "tpope";
        repo = "vim-salve";
        rev = "5958a99c4ac783cec668380917ac1f62b27466fe";
        sha256 = "1vs2rfhcxm9v4ndnsx85b1i29h67qv748k3nvdxc145v1hjcnapm";
      };
      meta.homepage = "https://github.com/tpope/vim-salve/";
    };
  