anchor.diff:  
     restic = buildFromGitHub {
       rev    = "4d7e802c44369b40177cd52938bc5b0930bd2be1";
  -    date   = "2016-01-17";
  +    version = "2016-01-17";
       owner  = "restic";
       repo   = "restic";
       sha256 = "0lf40539dy2xa5l1xy1kyn1vk3w0fmapa1h65ciksrdhn89ilrxv";
  
positive.code: 
    go-zipexe = buildFromGitHub {
      rev    = "a5fe2436ffcb3236e175e5149162b41cd28bd27d";
      date   = "2015-03-29";
      owner  = "daaku";
      repo   = "go.zipexe";
      sha256 = "0vi5pskhifb6zw78w2j97qbhs09zmrlk4b48mybgk5b3sswp6510";
  
negative.code: 
    kagome = buildFromGitHub {
      rev = "1bbdbdd590e13a8c2f4508c67a079113cd7b9f51";
      version = "2016-01-19";
      owner = "ikawaha";
      repo = "kagome";
      sha256 = "1isnjdkn9hnrkp5g37p2k5bbsrx0ma32v3icwlmwwyc5mppa4blb";
  