anchor.diff:  
     vim-flutter = buildVimPluginFrom2Nix {
       pname = "vim-flutter";
  -    version = "2019-09-29";
  +    version = "2020-07-06";
       src = fetchFromGitHub {
         owner = "thosakwe";
         repo = "vim-flutter";
  -      rev = "030a4e609f8f38922fa4ec9a27836d9dabaae957";
  -      sha256 = "0jibmr0v0pqml1cprs3qmkhhmacpb2bwpk8lhaz4dzp8jlga9g00";
  +      rev = "a865e5f0df4faaedfda1c2b5679b42d1a0267d44";
  +      sha256 = "04vl8cfk58m9p59j8hh0f9sp15dg7rm971nhmwhbbj7pq6b8dq8w";
       };
       meta.homepage = "https://github.com/thosakwe/vim-flutter/";
     };
  
positive.code: 
    YouCompleteMe = buildVimPluginFrom2Nix {
      pname = "YouCompleteMe";
      version = "2020-07-03";
      src = fetchFromGitHub {
        owner = "ycm-core";
        repo = "YouCompleteMe";
        rev = "195f730dfb4d818a81082b383e294a302f61bcfe";
        sha256 = "021z74is3bz746azxn05hzlrzd2asdb0kz5ab2fizgxl7n33cml0";
        fetchSubmodules = true;
      };
      meta.homepage = "https://github.com/ycm-core/YouCompleteMe/";
  
negative.code: 
    calendar-vim = buildVimPluginFrom2Nix {
      pname = "calendar-vim";
      version = "2020-07-07";
      src = fetchFromGitHub {
        owner = "itchyny";
        repo = "calendar.vim";
        rev = "dec99ba2de364773f06b23b907db137f1b52a449";
        sha256 = "1c89x4a4mrbb1l0avxazcxgwqapdw1ndqjhviij69ifybpi81jrn";
      };
      meta.homepage = "https://github.com/itchyny/calendar.vim/";
    };
  