anchor.diff:  
     go-multihash = buildFromGitHub {
       version = 2;
  -    rev = "54d61d0ef96ad9ff7e6b8825e52a255714c3c86a";
  +    rev = "31c3a74c91e5b82e7786023c84acc4d0a80affc9";
       owner  = "multiformats";
       repo   = "go-multihash";
  -    sha256 = "03knv6a4hw6mrd9lvx391i2a5fzp28brhric6gdvdpr8x17lpddw";
  +    sha256 = "0ycssxa2kn6qszdqy2aghsi98pv0iifvsmgj61qjbk8dxbfrymx5";
       goPackageAliases = [ "github.com/jbenet/go-multihash" ];
       propagatedBuildInputs = [
         crypto
  
positive.code: 
    liner = buildFromGitHub {
      version = 2;
      rev = "bf27d3ba8e1d9899d45a457ffac16c953eb2d647";
      owner = "peterh";
      repo = "liner";
      sha256 = "07dv24678gg3vp37xwjf446145ns9wyg2g9igfrhk2nlgkz7kxgc";
      date = "2017-02-11";
    };
  
    linode = buildFromGitHub {
  
negative.code: 
    govalidator = buildFromGitHub {
      version = 2;
      rev = "872bb01704d183fe276bce6fa429408a87661998";
      owner = "asaskevich";
      repo = "govalidator";
      sha256 = "1l6alymyqv11w6g95nncp26c575md2czmdpzkib9lkmx2lqa6az4";
      date = "2017-03-20";
    };
  
    go-autorest = buildFromGitHub {
  