\NeedsTeXFormat{LaTeX2e}
\documentclass[11pt]{book}
\title{Some Test Doc}
\begin{document}
\maketitle
\mainmatter
\chapter*{Preface}
\input{t/data/input.tex}
\end{document}
\NeedsTeXFormat{LaTeX2e}
\documentclass[11pt]{book}
\title{Some Test Doc}
\begin{document}
\maketitle
\mainmatter
\chapter*{Preface}
\input{t/data/input.tex}
\end{document}