anchor.diff:    pname = "lua-yajl";
     version = "2.0-1";
     knownRockspec = (fetchurl {
  -    url    = "https://raw.githubusercontent.com/rocks-moonscript-org/moonrocks-mirror/master/lua-yajl-2.0-1.rockspec";
  +    url    = "https://luarocks.org/lua-yajl-2.0-1.rockspec";
       sha256 = "0h600zgq5qc9z3cid1kr35q3qb98alg0m3qf0a3mfj33hya6pcxp";
     }).outPath;
     src = fetchgit ( removeAttrs (builtins.fromJSON ''{
  
positive.code: 
    src = fetchgit ( removeAttrs (builtins.fromJSON ''{
    "url": "https://github.com/lewis6991/gitsigns.nvim",
    "rev": "552f114caeaec4ce97822cb55dfa7c7e5368136b",
    "date": "2021-10-15T13:31:44+01:00",
    "path": "/nix/store/40vkv3sc4h6gh9ac88k7pilszxmy38yv-gitsigns.nvim",
    "sha256": "0qdafm3arjf8bcqpvv085dwzbikad3sr3xzvrn3gfa0dsls8pg6q",
    "fetchLFS": false,
    "fetchSubmodules": true,
    "deepClone": false,
  
negative.code: 
    src = fetchgit ( removeAttrs (builtins.fromJSON ''{
    "url": "https://github.com/nvim-lua/plenary.nvim",
    "rev": "c2bb2d8fd5b44bfc6aad3a5463c84576a98dd4a9",
    "date": "2021-12-06T21:11:29+01:00",
    "path": "/nix/store/h376md0lpbv31n5wyrq0cilkpx2lkr18-plenary.nvim",
    "sha256": "12csjz882yv9wwhzx964fq210655m8820491xjsrjlwccfc09i35",
    "fetchLFS": false,
    "fetchSubmodules": true,
    "deepClone": false,
  