/oldtest/test-index-error.tex

\documentclass[
    letterpaper % use letter paper
]{book}
\usepackage{makeidx}

\makeindex

\begin{document}

\tableofcontents
\listoffigures

\chapter{first chapter}

Some text that has to do with the first chapter.  Frog\index{frog}.

\section{first section}

% produces an error (thanks to abachn for the test case)
Class \index{class!!class}
Object \index{object@@object}

\printindex

\end{document}

% vim: lbr