anchor.diff:  
   provides "rbenv"
   provides "rbenv/root"
  -provides "rbenv/prefix"
  +provides "rbenv/current_version"
  +provides "rbenv/current_version_prefix"
   provides "rbenv/global"
   provides "rbenv/versions"
   
  
positive.code: 
  def root
    status, stdout, stderr = rbenv_command("root")
    status == 0 ? stdout : nil
  end
  
  
negative.code:   versions
  end
  
  rbenv[:root]                   = root
  rbenv[:current_version]        = version
  rbenv[:current_version_prefix] = prefix
  rbenv[:global]                 = global
  rbenv[:versions]               = versions
  