anchor.diff:    };
   
     tools = buildFromGitHub {
  -    version = 2;
  -    rev = "9a6c6fca12efdd355f948c5b748b8b48edbb4ef0";
  -    date = "2017-04-26";
  +    version = 3;
  +    rev = "2382e3994d48b1d22acc2c86bcad0a2aff028e32";
  +    date = "2017-04-28";
       owner = "golang";
       repo = "tools";
  -    sha256 = "087bv7ll4kx8amcgzx3w6vjq6w0mzllzvqx74zxpa9w4x6iyigzz";
  +    sha256 = "1i8rfq2l6vfdsj358k9fran2h1cc4dr28kncv17s4gw5w9zd9iya";
       goPackagePath = "golang.org/x/tools";
       goPackageAliases = [ "code.google.com/p/go.tools" ];
   
  
positive.code:   };
  
    pflag = buildFromGitHub {
      version = 2;
      owner = "spf13";
      repo = "pflag";
      rev = "2300d0f8576fe575f71aaa5b9bbe4e1b0dc2eb51";
      date = "2017-04-18";
      sha256 = "05xg5j1knc4inbj22bk8s6p346klnz5szq68292nnl5vkvs52rff";
    };
  
    pkcs7 = buildFromGitHub {
  
negative.code:   };
  
    aws-sdk-go = buildFromGitHub {
      version = 3;
      rev = "v1.8.17";
      owner  = "aws";
      repo   = "aws-sdk-go";
      sha256 = "08zkm1w1f6pcmi6jxlqwx67x0hls9nc4zpfwx12i9nwgm9gy7anj";
      excludedPackages = "\\(awstesting\\|example\\)";
      buildInputs = [
        tools
  