NAnt vs Rake: Rename a Directory

NAnt:
<move todir="${package.dir}\${new.name}" includeemptydirs="true">
  <fileset basedir="${package.dir}\${old.name}" >
    <include name="**\*" /> 
  </fileset>
</move>
<delete dir="${package.dir}\${old.name}"  />

Rake:
require 'fileutils'
mv "#{package_dir}/#{old_name}" "#{package_dir}/#{new_name}"