\newcommand{\SPLC}{\texttt{SPLC}}
\newcommand{\SPL}{\texttt{SPL}}
\newcommand{\SSM}{\texttt{SSM}}
+\newcommand{\Yard}{\textsc{Yard}}
\def\AST/{\texttt{AST}}
\let\tt\texttt
\input{ext.tex}
+\newpage
+\section{Appendices}
+\subsection{Grammar}
+\lstinputlisting[label={lst:grammar}{../../grammar/grammar.txt}
+
\end{document}