anchor.diff:      version = 5;
       owner = "elves";
       repo = "elvish";
  -    rev = "6bbbcc787355bb61909cb8c345d866393ba1e8d0";
  -    sha256 = "00ym66dv51spz1b959c7as1jwm68dwx0q62lpfkvxjlmkh1mm4s4";
  +    rev = "763ca79d1ef07f103e432a42a5c698926b11657c";
  +    sha256 = "1ciaawzp53s8sxavnas19bxdhjqpw46dvccjmhpskxmi3mc6xij6";
       propagatedBuildInputs = [
         bolt
         go-isatty
  
positive.code:   };
  
    bolt = buildFromGitHub {
      version = 3;
      rev = "v1.3.1";
      owner  = "boltdb";
      repo   = "bolt";
      sha256 = "0j1dmlp9sh1v5kpxzvamyjdwlb0pndpy9a2qjhg2q93ri3dbfr58";
      buildInputs = [
        sys
      ];
    };
  
    btcd = buildFromGitHub {
  
negative.code: 
    sys = buildFromGitHub {
      version = 5;
      rev = "dd2ff4accc098aceecb86b36eaa7829b2a17b1c9";
      date = "2018-03-02";
      owner  = "golang";
      repo   = "sys";
      sha256 = "18rrqizw905r0p6qgklj4x8hm3kfkkfismf2q08qzki694plb0va";
      goPackagePath = "golang.org/x/sys";
    };
  
  