anchor.diff:  
     aniseed = buildVimPluginFrom2Nix {
       pname = "aniseed";
  -    version = "2021-01-08";
  +    version = "2020-12-21";
       src = fetchFromGitHub {
         owner = "Olical";
         repo = "aniseed";
  
positive.code: 
    vim-clap = buildVimPluginFrom2Nix {
      pname = "vim-clap";
      version = "2021-01-05";
      src = fetchFromGitHub {
        owner = "liuchengxu";
        repo = "vim-clap";
        rev = "83cac4972caef144d0e947025ff43af6fd2becac";
        sha256 = "18cackh5rrkyg7ffhwp4vca6srr1hlj3gximjdwc6krcgq0v0r0s";
      };
      meta.homepage = "https://github.com/liuchengxu/vim-clap/";
    };
  
negative.code: 
    vim-airline = buildVimPluginFrom2Nix {
      pname = "vim-airline";
      version = "2021-01-08";
      src = fetchFromGitHub {
        owner = "vim-airline";
        repo = "vim-airline";
        rev = "fdfc11f53adce1bd6644a5dac6002106ef08db95";
        sha256 = "1bas31zkrkz6pxsxnh5s4kph861z85gxg0fik0psd698yg9zzgc1";
      };
      meta.homepage = "https://github.com/vim-airline/vim-airline/";
    };
  