anchor.diff:      version = 2;
       owner = "klauspost";
       repo = "reedsolomon";
  -    date = "2017-01-05";
  -    rev = "c056598956acbb4a085b3c23914415937b3335e5";
  -    sha256 = "052j49r3n4zvbrmpqsad1gwmm5ndpi3pdhxb7zqakzmxrw45haki";
  +    date = "2017-02-19";
  +    rev = "5abf0ee302ccf4834e84f63ff74eca3e8b88e4e2";
  +    sha256 = "1r6yk16id1nk1qmpn21g6cw4ipy68j2711mc8ysd39js3pginff2";
       propagatedBuildInputs = [
         cpuid
       ];
  
positive.code: 
    ini = buildFromGitHub {
      version = 2;
      rev = "v1.24.0";
      owner  = "go-ini";
      repo   = "ini";
      sha256 = "08rqn1v0ddck48iin1w3mg0crjc9xm0v27hvw40j9psi5gcl8187";
    };
  
    ini_v1 = buildFromGitHub {
      version = 2;
      rev = "v1.24.0";
      owner  = "go-ini";
      repo   = "ini";
      goPackagePath = "gopkg.in/ini.v1";
      sha256 = "0ch805c3bx5p85q7gi2iawn041bsdr7ckwqzm4fi9r18ikvjhjs4";
    };
  
    inject = buildFromGitHub {
  
negative.code: 
    prometheus_client_golang = buildFromGitHub {
      version = 2;
      rev = "69bb3870645f63c67a8dc9c9ef94585fd0d98c80";
      owner = "prometheus";
      repo = "client_golang";
      sha256 = "1x48k9wdfc0bn3w7wplx9xkv87p19l5b5a7dczhli3h76gfvc4gn";
      propagatedBuildInputs = [
        goautoneg
        net
  