anchor.diff:  
     godep = buildFromGitHub {
       rev    = "5598a9815350896a2cdf9f4f1d0a3003ab9677fb";
  -    date   = "2015-10-15";
  +    version = "2015-10-15";
       owner  = "tools";
       repo   = "godep";
       sha256 = "0zc1ah5cvaqa3zw0ska89a40x445vwl1ixz8v42xi3zicx16ibwz";
  
positive.code: 
    kagome = buildFromGitHub {
      rev = "1bbdbdd590e13a8c2f4508c67a079113cd7b9f51";
      date = "2016-01-19";
      owner = "ikawaha";
      repo = "kagome";
      sha256 = "1isnjdkn9hnrkp5g37p2k5bbsrx0ma32v3icwlmwwyc5mppa4blb";
  
negative.code: 
    mattn.go-runewidth = buildFromGitHub {
      rev    = "d6bea18f789704b5f83375793155289da36a3c7f";
      version = "2016-03-15";
      owner  = "mattn";
      repo   = "go-runewidth";
      sha256 = "1hnigpn7rjbwd1ircxkyx9hvi0xmxr32b2jdy2jzw6b3jmcnz1fs";
  