Could someone having the LaTeX PLS try this:
cat <<"EOF" >ck_pls.tex
\documentclass{article}
\usepackage[utf8]{inputenc}
\begin{document}
{
\catcode`\{=2
Changing the closing group in local scope!
{
\catcode`\@=0
\catcode`\\=12
{@bf After changing the active char}, while the grouping chars have
been restored since the local scope is gone.
@end{document}
EOF
Note: it is valid TeX code
--
Thierry Laronde <tlaronde +AT+ kergis +dot+ com>
http://www.kergis.com/
http://kertex.kergis.com/
Key fingerprint = 0FF7 E906 FBAF FE95 FD89 250D 52B1 AE95 6006 F40C
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