[l2h] \excludecomment problem

[Graham Gough]

This is more of a latex question than l2h, but it's related to
html.sty. Using the latest version of html.sty and the following

    \documentclass{article}
    \usepackage{html}

    \includecomment{one}
    \excludecomment{two}

    \begin{document}
    Zero

      \begin{one}
        One 
      \end{one}

      \begin{two}
        Two
      \end{two}

    Three
    \end{document}


I get the error message
Runaway argument?
! File ended while scanning use of \html@next.

Changing excludecomment to includecomment everything is fine. I've
used \excludecomment successfully in the past so am a bit mystified by
this. Anyone any ideas?

Graham