\input regression-test.tex
\documentclass{article}
\makeatletter
\def\mode{\@ifstar\test@star\test@mode}
\def\test@star{\TYPE{NATIVE STAR}}
\def\test@mode<#1>{%
  \@ifnextchar\bgroup
    {\test@inline{#1}}
    {\TYPE{NATIVE SWITCH #1}}}
\def\test@inline#1#2{\TYPE{NATIVE INLINE #1}}
\makeatother
\usepackage[mode=script]{osglecture-modes}
\begin{document}
\START
\mode<script>{\TYPE{PORTABLE INLINE}}
\mode<script||presentation>{\TYPE{PORTABLE OR}}
\mode<presentation:sw-a|script:sw-b>{\TYPE{QUALIFIED BODY}}
\mode<script|handout>{\TYPE{PIPE BODY}}
\mode<backend-special>{ignored}
\mode<backend-switch>
\mode*
\END
\end{document}