anchor.diff:    };
   
     toml = buildFromGitHub {
  +    version = 1;
       owner = "BurntSushi";
       repo = "toml";
       rev = "v0.2.0";
  
positive.code:   };
  
    tools = buildFromGitHub {
      rev = "8ea9d4606980305f7f46cabde046adbb530e71c8";
      date = "2016-08-01";
      owner = "golang";
  
negative.code:   };
  
    go-spew = buildFromGitHub {
      version = 1;
      rev = "v1.0.0";
      owner  = "davecgh";
      repo   = "go-spew";
  