\def\z@comment#1{$\z@stopfield\z@addfield\z@startfield$\global\setbox\z@combox\hbox{\quad[{\sf #1}]}\z@wdcalc=\wd\z@combox\advance\z@wdcalc by \wd\z@curline\advance\z@wdcalc by \z@curindent\advance\z@wdcalc by \zedleftsep\advance\z@wdcalc by \zedlinethickness\advance\z@wdcalc by 2\zedindent\ifdim\z@wdcalc>\displaywidth\\\fi&\box\z@combox\ignorespaces}
\@latexerr{This Z environment is only allowed within a class}
{Perhaps you forgot to include a \string\begin\string{class\string}
somewhere^^Jor you are trying to print a file that needs updating.^^J\@ehc} \fi}
\def\z@outclasscheck{\ifz@inclass
\@latexerr{This Z environment is not allowed inside a class}
{This environment doesn't really make sense within a class.^^J%
If you really want it then I'll try my best to fit in in.^^J\@ehc}\else
\ifz@inenv \@latexerr{New Z environment declared before previous
one is completed}
{I suspect that you've forgotten to finish the last environment.^^J%
You are trying to nest environments and this can only be done inside classes^^J%
besides, the environment you have started isn't valid within classes any way.^^JI suggest that you type \space X <return> \space to quit and then correct your document.}
