anchor.diff:  
     go-github = buildFromGitHub {
       version = 2;
  -    date = "2017-03-21";
  -    rev = "d683a1c6198d75c6be7a7ab5e2f9834cb6408834";
  +    date = "2017-03-28";
  +    rev = "3c8f26c1ae8c61ba5d06731b36435a4f46ea9da5";
       owner = "google";
       repo = "go-github";
  -    sha256 = "0x2wvirz9hhjjnm7v9m7lg7qx20krmz7s5r8f6hxs8zzbh7fkh0q";
  +    sha256 = "0vflrv1q8hllm0rlldny7c3s4x6b397l9lya3f2x370g0j42jbqw";
       buildInputs = [
         appengine
         oauth2
  
positive.code:     version = 2;
      owner = "minio";
      repo = "minio-go";
      rev = "29b05151452ac74ee9b46c93c2200f8b57331e24";
      sha256 = "1k9fa7biyy7s087xjq9myg9bx5xyp0vy7qbg8j0vflvxwnljsnil";
      meta.useUnstable = true;
      date = "2017-03-24";
    };
  
    missinggo = buildFromGitHub {
  
negative.code: 
    google-cloud-go = buildFromGitHub {
      version = 2;
      date = "2017-03-30";
      rev = "555608f6976e49e654d81d2473623540d43d0b61";
      owner = "GoogleCloudPlatform";
      repo = "google-cloud-go";
      sha256 = "0ni0cfykla88v3wpksbdffi21hvn5m02c60c8ap1ybc2dsq28rwm";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  