anchor.diff:        nitro
         osext
         pflag
  +      prose
         purell
         text
         toml
  
positive.code: 
    decimal = buildFromGitHub {
      version = 3;
      rev = "3c692774ac4c47c7a296ec96e553719dba1a68fc";
      owner  = "shopspring";
      repo   = "decimal";
      sha256 = "1ydxpvjdwxbfh2rfzlg4g9k8l70hcsx36bgrzqpcd5a6wipp7w5j";
      date = "2017-07-28";
    };
  
    demangle = buildFromGitHub {
  
negative.code:       go-errors
        go-github
        go-glob
        go-hclog
        go-hdb
        go-homedir
        go-mssqldb
  