\input regression-test.tex
\DocumentMetadata{}
\documentclass{ltx-talk}
\NewDocumentCommand\lecture{O{}mm}{\TYPE{LECTURE KEPT}}
\RenewDocumentCommand\againframe{d<> O{} m}
  {
    \IfNoValueTF{#1}
      {\TYPE{AGAINFRAME~#2~#3}}
      {\TYPE{AGAINFRAME~<#1>~#2~#3}}
  }
\usepackage[ignorenonframetext]{osglecture-modes-ltxtalk}

\begin{document}
\START
\lecture{Introduction}{intro}
\foobar
\againframe{plain}
\againframe[opt]{withopt}
\againframe<2->[opt]{withoverlay}
\begin{frame}
  \TYPE{FRAME KEPT}
\end{frame}
\END
\end{document}