an uncompilable output with \left( and \right)

[rsato64]

I found a problem when I run latexdiff old.tex new.tex with the following source files.

old.tex:

\documentclass{article} \begin{document} text \end{document}

new.tex:

\documentclass{article} \begin{document} text \begin{eqnarray} \left( {\cal A} \right) \end{eqnarray} \end{document}

The output is

\begin{document} text \DIFaddbegin \begin{eqnarray} \DIFadd{\left( }{\DIFadd{\cal A}} \DIFadd{\right) }\end{eqnarray} \DIFaddend\end{document}

This output is uncompilable.

[ftilmann]

Actually, when I try to compile I get an error message but if I skip this and a few following (or use pdflatex -interaction=nonstopmode the output generated is actually correct). Or, if in new.tex, the unneeded set of braces are removed, i.e. if the eqn array environment is written as \left( \cal{A} \right), then the processing is done correctly, too. (The need to always using braces for arguments is one of the documented latexdiff limitations, so I wrote \cal{A} instead of \cal A, even though the latter would work in this particular instance). Although this is not perfect, and your report is in principle a bona-fide bug report, I will close this issue, as there is no easy fix, and a fix is not really needed.