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-% Copyright 2011 Barbara Beeton <tex-live@tug.org>
-% You may freely use, modify and/or distribute this file.
-% This is the original annotated test report, with various extra info.
-% See below \end{document}.
-\documentclass{amsbook}
-\usepackage{verbatim}
-
-\makeindex
-
-\begin{document}
-
-\chapter{Demonstration of a Makeindex bug}
-
-\index{random text|(}%
-Here we open an index span for ``random text''.
-
-\index{periodic Hilbert transform|(}%
-How could we define the \emph{periodic Hilbert transform}?
-Here is an open index span for ``periodic Hilbert transform''.
-
-(lots more text omitted)
-\newpage
-
-We defined in Section~3 the
-\index{periodic Hilbert transform|(}%
-\emph{periodic Hilbert transform} or \emph{conjugate function}.
-A second open index span for ``periodic Hilbert transform''.
-
-\index{random text|(}%
-(more omitted text and a second open index span for ``random text'')
-
-Closing index spans for the two opened entries.
-\index{periodic Hilbert transform|)}%
-\index{random text|)}%
-
-\vspace{1\baselineskip}
-\verbatiminput{\jobname.tex}
-\newpage
-\noindent This is the .idx file from the previous run:
-\verbatiminput{\jobname.idx-prev}
-\vspace{2\baselineskip}
-This is the resulting .ilg file:
-\verbatiminput{\jobname.ilg}
-\vspace{2\baselineskip}
-And the resulting .ind file; note spurious \verb+\(+ inclusions.
-\verbatiminput{\jobname.ind}
-\end{document}
-
-
-Date: Thu, 22 Sep 2011 12:23:48 -0400
-From: Barbara Beeton
-Subject: a makeindex bug
-
-[...]
-
-to get the desired output, run latex, then makeindex.
-copy or rename <jobname>.idx to <jobname>.idx-prev,
-rerun latex, and take a look at the output. (the
-reason for the rename is that i've included in the
-output listings of the .idx(-prev), .ilg, and .ind
-files, all small, but very interesting.)
-
-the problem is that if a span is begun for a string
-and then a second span is begun for the same string
-without the first one being closed, the |( in the
-input is put into the output as \( -- with the
-result that an attempt to print the index will get
-an unmatched $ error. the unmatched span is noted
-in the .ilg file with a warning, but since most
-people ignore warnings the first time around (i
-certainly do), the unrecoverable (la)tex error in
-the index can really throw them into a tizzy.