[xsl] last() and distinct-values 2.0

[Jurn Ho <jurn@xxxxxxxxxxxxxxxx>]

Hi,

I'm trying to change our stylesheets over to 2.0 and saxon 8, but am 
getting confused about the behaviour of the last() function.
My test case is below, it has a variable called $languages, with many 
<lang> elements.
I wanted to get the 3 distinct languages from there.
If I comment out the last() function, it works as I expect, but when I add 
the last() function inside the for-each loop I get it returning '2', and 
only get 1 iteration from the loop.
I expect the last() function to return 3.

Any suggestions/hints would be welcome

thanks,
Jurn

<?xml version="1.0"?>
<xsl:stylesheet version="2.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                xmlns:fn="http://www.w3.org/2003/11/xpath-functions";>
  <xsl:template match="/">
    <xsl:variable name="languages">
      <lang>English</lang>
      <lang>English</lang>
      <lang>Chinese</lang>
      <lang>French</lang>
      <lang>French</lang>
      <lang>Chinese</lang>
      <lang>French</lang>
      <lang>Chinese</lang>
    </xsl:variable>
    <xsl:for-each select="fn:distinct-values($languages/lang)">
      <xsl:value-of select="position()"/>,
      <xsl:value-of select="."/>,
      <xsl:value-of select="last()"/>
      --
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>