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