anchor.diff:        sys
       ];
       meta.useUnstable = true;
  -    date = "2018-02-15";
  +    date = "2018-03-02";
     };
   
     eme = buildFromGitHub {
  
positive.code:     version = 5;
      owner = "elves";
      repo = "elvish";
      rev = "6bbbcc787355bb61909cb8c345d866393ba1e8d0";
      sha256 = "00ym66dv51spz1b959c7as1jwm68dwx0q62lpfkvxjlmkh1mm4s4";
      propagatedBuildInputs = [
        bolt
        go-isatty
  
negative.code: 
    sys = buildFromGitHub {
      version = 5;
      rev = "dd2ff4accc098aceecb86b36eaa7829b2a17b1c9";
      date = "2018-03-02";
      owner  = "golang";
      repo   = "sys";
      sha256 = "18rrqizw905r0p6qgklj4x8hm3kfkkfismf2q08qzki694plb0va";
      goPackagePath = "golang.org/x/sys";
    };
  
  