anchor.diff:  
     vim-jsbeautify = buildVimPluginFrom2Nix {
       pname = "vim-jsbeautify";
  -    version = "2019-01-21";
  +    version = "2019-03-01";
       src = fetchFromGitHub {
         owner = "maksimr";
         repo = "vim-jsbeautify";
  -      rev = "a0ccb51b4e05fefd06a868df8a7e0b64ac5ec4ce";
  -      sha256 = "0739vga8mh53ljl0w48vw467r6fzarqrwxz2wr3k8dm58kpq86xr";
  +      rev = "aa96718ddc74bc20dd6b44a179eb0ee66443339f";
  +      sha256 = "1v7h7xdhkiifcjk1bqiw7nfz4bxbrbaqghmi31564xdgckqfqcqk";
         fetchSubmodules = true;
       };
     };
  
positive.code: 
    undotree = buildVimPluginFrom2Nix {
      pname = "undotree";
      version = "2019-01-30";
      src = fetchFromGitHub {
        owner = "mbbill";
        repo = "undotree";
        rev = "db0223fc6857c160b2394489094355feb20318f2";
        sha256 = "0ncqwn0gdz23gp9avdqkd8l0z6zc87m0xmi63b0axarp1lfazr56";
      };
    };
  
  
negative.code: 
    zig-vim = buildVimPluginFrom2Nix {
      pname = "zig-vim";
      version = "2019-02-22";
      src = fetchFromGitHub {
        owner = "zig-lang";
        repo = "zig.vim";
        rev = "1036ba58daceb4df155f4b14485eb4864b4c7827";
        sha256 = "0023rdin6n4d1hyxslp3cdag41y4yby9b7ckxf14yxg66v5ylm54";
      };
    };
  
  