anchor.diff:  
     procfs = buildFromGitHub {
       version = 5;
  -    rev = "cb4147076ac75738c9a7d279075a253c0cc5acbd";
  -    date = "2018-01-25";
  +    rev = "282c8707aa210456a825798969cc27edda34992a";
  +    date = "2018-02-12";
       owner  = "prometheus";
       repo   = "procfs";
  -    sha256 = "126fvs00g1asj3lyhyb292w246dpicl3a2dsbg9cc1gbb7vkvhvz";
  +    sha256 = "1gwinmp95hg0zbzpk1mh58mfrfmqsf59fm25sg3r87xvrvwgx26g";
     };
   
     profile = buildFromGitHub {
  
positive.code: 
    aws-sdk-go = buildFromGitHub {
      version = 5;
      rev = "v1.12.74";
      owner  = "aws";
      repo   = "aws-sdk-go";
      sha256 = "0akasc47n5mpr40k08s92hfgy7wd73jnwqzh0fpqz6w31sbwl4sy";
      excludedPackages = "\\(awstesting\\|example\\)";
      buildInputs = [
        tools
  
negative.code: 
      excludedPackages = "\\(test\\|benchmark\\|example\\|bridge\\)";
      meta.useUnstable = true;
      date = "2018-02-14";
    };
  
    etcd_client = etcd.override {
  