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+% \iffalse meta-comment
+%
+% Copyright 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
+% The LaTeX3 Project and any individual authors listed elsewhere
+% in this file.
+%
+% This file is part of the LaTeX base system.
+% -------------------------------------------
+%
+% It may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2003/12/01 or later.
+%
+% This file has the LPPL maintenance status "maintained".
+%
+% The list of all files belonging to the LaTeX base distribution is
+% given in the file `manifest.txt'. See also `legal.txt' for additional
+% information.
+%
+% The list of derived (unpacked) files belonging to the distribution
+% and covered by LPPL is defined by the unpacking scripts (with
+% extension .ins) which are part of the distribution.
+%
+% \fi
+% \iffalse
+%%% From File: ltmiscen.dtx
+%
+%<*driver>
+% \fi
+\ProvidesFile{ltmiscen.dtx}
+ [2000/07/11 v1.1j LaTeX Kernel (Misc. Environments)]
+% \iffalse
+\documentclass{ltxdoc}
+\GetFileInfo{ltmiscen.dtx}
+\title{\filename}
+\date{\filedate}
+ \author{%
+ Johannes Braams\and
+ David Carlisle\and
+ Alan Jeffrey\and
+ Leslie Lamport\and
+ Frank Mittelbach\and
+ Chris Rowley\and
+ Rainer Sch\"opf}
+
+\begin{document}
+\maketitle
+ \DocInput{\filename}
+\end{document}
+%</driver>
+% \fi
+%
+% \CheckSum{457}
+%
+% \changes{v1.0c}{1994/03/28}{Improve Documentation}
+% \changes{v1.0d}{1994/03/29}{Remove counter macros to ltcntlen}
+% \changes{v1.0g}{1994/05/02}{Changed 91 to 1991 and moved some bits}
+% \changes{v1.0i}{1994/05/05}{Removed braces from ifnextchar and
+% ifstar arguments}
+% \changes{v1.0m}{1994/05/20}{Use new warning commands}
+% \changes{v1.0n}{1994/05/21}{Use new error commands}
+% \changes{v1.0s}{1994/10/14}{Move math to other file}
+% \changes{v1.0v}{1994/11/17}
+% {\cs{@tempa} to \cs{reserved@a}}
+% \changes{v1.0x}{1995/04/22}{Removed extra def of \cs{@gobble}}
+% \changes{v1.0z}{1995/07/13}{Improve Documentation}
+% \changes{v1.1c}{1996/04/22}{Improve Documentation}
+% \changes{v1.1d}{1996/06/03}{Move setting of verbatim font and
+% \cs{@noligs}.}
+% \changes{v1.1g}{1998/08/17}{(RmS) Minor documentation fixes.}
+%
+% \section{Miscellaneous Environments}
+% This section implements the basic environment mechanism, and also
+% a few specific environments including |document|, The math
+% environments and related commands, the `flushing' environments,
+% (|center|, |flushleft|, |flushright|), and |verbatim|.
+%
+% \StopEventually{}
+%
+% \begin{macrocode}
+%<*2ekernel>
+\message{environments,}
+% \end{macrocode}
+%
+% \subsection{Environments}
+%
+% |\begin{foo}| and |\end{foo}| are used to delimit environment |foo|.
+%
+% |\begin{foo}| starts a group and calls |\foo| if it is defined,
+% otherwise it does nothing.
+%
+% |\end{foo}| checks to see that it matches the
+% corresponding |\begin| and if so, it calls |\endfoo| and does an
+% |\endgroup|. Otherwise, |\end{foo}| does nothing.
+%
+% If |\end{foo}| needs to ignore blanks after it, then |\endfoo| should
+% globally set the |@ignore| switch true with |\@ignoretrue|
+% (this will automatically be global).
+%
+%
+% NOTE: |\@@end| is defined to be the |\end| command of \TeX82.
+%
+% |\enddocument| is the user's command for ending the manuscript file.
+%
+% |\stop| is a panic button --- to end \TeX\ in the middle.
+%
+% \begin{oldcomments}
+% \enddocument ==
+% BEGIN
+% \@checkend{document} %% checks for unmatched \begin
+% \clearpage
+% \begingroup
+% if @filesw = true
+% then close file @mainaux
+% if G@refundefined = true
+% then LaTeX Warning: 'There are undefined references.' fi
+% if @multiplelabels = true
+% then LaTeX Warning:
+% 'One or more label(s) multiply defined.'
+% else
+% \@setckpt {ARG1}{ARG2} == null
+% \newlabel{LABEL}{VAL} ==
+% BEGIN
+% \reserved@a == VAL
+% if def(\reserved@a) = def(\r@LABEL)
+% else @tempswa := true fi
+% END
+% \bibcite{LABEL}{VAL} == null
+% BEGIN
+% \reserved@a == VAL
+% if def(\reserved@a) = def(\g@LABEL)
+% else @tempswa := true fi
+% END
+% @tempswa := false
+% make @ a letter
+% \input \jobname.AUX
+% if @tempswa = true
+% then LaTeX Warning: 'Label may have changed.
+% Rerun to get cross-references right.'
+% fi fi fi
+% \endgroup
+% finish up
+% END
+%
+% \@writefile{EXT}{ENTRY} ==
+% if tf@EXT undefined
+% else \write\tf@EXT{ENTRY}
+% fi
+% \end{oldcomments}
+%
+% \begin{macro}{\@currenvir}
+% The name of the current environment. Initialized to
+% \texttt{document} to so that |\end{document}| works correctly.
+% \begin{macrocode}
+\def\@currenvir{document}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\if@ignore}
+% \begin{macro}{\@ignoretrue}
+% \begin{macro}{\@ignorefalse}
+% \changes{v1.1e}{1996/07/26}{put \cs{global} into definition}
+% \begin{macrocode}
+\def\@ignorefalse{\global\let\if@ignore\iffalse}
+\def\@ignoretrue {\global\let\if@ignore\iftrue}
+\@ignorefalse
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+%
+% \begin{macro}{\ignorespacesafterend}
+% \changes{v1.1e}{1996/07/26}{user level macro added}
+% \begin{macrocode}
+\let\ignorespacesafterend\@ignoretrue
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\enddocument}
+% \changes{LaTeX2.09}{1993/08/03}
+% {Changed redefinition of \cs{global} to redefinition
+% of \cs{@setckpt}.}
+% \changes{LaTeX2.09}{1993/09/08}
+% {Added warning in case of undefined references.}%
+% \changes{v0.9e}{1993/12/09}{Hook added}
+% \begin{macrocode}
+\def\enddocument{%
+% \end{macrocode}
+% The |\end{document}| hook is executed first. If necessary it can
+% contain a |\clearpage| to output dangling floats first. In this
+% position it can also contain something like |\end{foo}| so that
+% the whole document effectively starts and ends with some special
+% environment. However, this must be used with care, eg if two
+% applications would use this without knowledge of each other the
+% order of the environments will be wrong after all.
+% |\AtEndDocument| is redefined
+% at this point so that and such commands that get into the hook do
+% not chase their tail\ldots
+% \changes{v1.0y}{1995/04/27}{\cs{@checkend} moved after hook}
+% \changes{v1.0z}{1995/07/13}{Set \cs{@setckpt} to \cs{@gobbletwo}
+% instead of defining it by hand}
+% \changes{v1.1i}{2000/05/19}
+% {Reset \cs{AtEndDocument} for latex/3060}
+% \begin{macrocode}
+ \let\AtEndDocument\@firstofone
+ \@enddocumenthook
+ \@checkend{document}%
+ \clearpage
+ \begingroup
+ \if@filesw
+ \immediate\closeout\@mainaux
+ \let\@setckpt\@gobbletwo
+ \let\@newl@bel\@testdef
+% \end{macrocode}
+% \changes{v1.0z}{1995/07/13}{Sorten redefinition of \cs{bibcite} and
+% \cs{newlabel}}
+% The previous line is equiv to setting
+%\begin{verbatim}
+% \def\newlabel{\@testdef r}%
+% \def\bibcite{\@testdef b}%
+%\end{verbatim}
+% \begin{macrocode}
+ \@tempswafalse
+ \makeatletter \input\jobname.aux
+ \fi
+% \end{macrocode}
+% \changes{v1.0w}{1994/11/30}
+% {(DPC) Use \cs{@dofilelist}}
+% \begin{macrocode}
+ \@dofilelist
+% \end{macrocode}
+% First we check for font size substitution bigger than
+% |\fontsubfuzz|. The |\relax| is necessary because this is a macro
+% not a register.
+% \changes{v1.0w}{1994/11/30}
+% {(DPC) Do warnings even for \cs{nofiles}}
+% \begin{macrocode}
+ \ifdim \font@submax >\fontsubfuzz\relax
+% \end{macrocode}
+% In case you wonder about the |\@gobbletwo| inside the message
+% below, this is a horrible hack to remove the tokens |\on@line.|
+% that are added by |\@font@warning| at the end.
+% \changes{v1.1j}{2000/07/11}{Fix typo in warning}
+% \begin{macrocode}
+ \@font@warning{Size substitutions with differences\MessageBreak
+ up to \font@submax\space have occurred.\@gobbletwo}%
+ \fi
+% \end{macrocode}
+% The macro |\@defaultsubs| is initially |\relax| but gets redefined
+% to produce
+% a warning if there have been some default font substitutions.
+% \changes{v1.0z}{1995/07/13}{Use \cs{\@defaultsubs} instead of switch}
+% \begin{macrocode}
+ \@defaultsubs
+% \end{macrocode}
+% The macro |\@refundefined| is initially |\relax| but gets redefined
+% to produce a warning if there are undefined refs.
+% \changes{v1.1b}{1995/10/24}{Use \cs{\@refundefined} instead of switch}
+% \begin{macrocode}
+ \@refundefined
+% \end{macrocode}
+% If a label is defined more than once, |\@tempswa| will always be
+% true and thus produce a ``Label(s) may \ldots'' warning. But
+% since a rerun will not solve that problem (unless one uses a
+% package like \texttt{varioref} that generates labels on the fly),
+% we suppress this message.
+% \changes{v1.0e}{1994/04/20}{Changed logic for producing
+% warning messages}
+% \changes{v1.1b}{1995/10/24}{Changed logic for producing
+% warning messages and removed switch}
+% \begin{macrocode}
+ \if@filesw
+ \ifx \@multiplelabels \relax
+ \if@tempswa
+ \@latex@warning@no@line{Label(s) may have changed.
+ Rerun to get cross-references right}%
+ \fi
+ \else
+ \@multiplelabels
+ \fi
+ \fi
+ \endgroup
+ \deadcycles\z@\@@end}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@testdef}
+% \begin{macrocode}
+\def\@testdef #1#2#3{%
+ \def\reserved@a{#3}\expandafter \ifx \csname #1@#2\endcsname
+ \reserved@a \else \@tempswatrue \fi}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\@writefile}
+% \changes{v1.0l}{1994/05/20}{Added correct setting of \cs{protect}.}
+% \changes{v1.0t}{1994/11/04}{Removed setting of \cs{protect}. ASAJ.}
+% \changes{v1.0z}{1995/07/13}{Added missing percent and use \cs{relax}
+% in the THEN case}
+% \begin{macrocode}
+\long\def\@writefile#1#2{%
+ \@ifundefined{tf@#1}\relax
+ {\@temptokena{#2}%
+ \immediate\write\csname tf@#1\endcsname{\the\@temptokena}%
+ }%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\stop}
+% \begin{macrocode}
+\def\stop{\clearpage\deadcycles\z@\let\par\@@par\@@end}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{oldcomments}
+%
+% \begin{macrocode}
+\everypar{\@nodocument} %% To get an error if text appears before the
+\nullfont %% \begin{document}
+% \end{macrocode}
+%
+% \begin, \end, and \@checkend changed so \end{document} will catch
+% an unmatched \begin. Changed 24 May 89 as suggested by
+% Frank Mittelbach and Rainer Sch\"opf.
+%
+% \begin{NAME} ==
+% BEGIN
+% IF \NAME undefined THEN \reserved@a == BEGIN report error END
+% ELSE \reserved@a ==
+% (\@currenvir :=L NAME) \NAME
+% FI
+% @ignore :=G F %% Added 30 Nov 88
+% \begingroup
+% \@endpe := F
+% \@currenvir :=L NAME
+% \NAME
+% END
+%
+% \end{NAME} ==
+% BEGIN
+% \endNAME
+% \@checkend{NAME}
+% \endgroup
+% IF @endpe = T %% @endpe set True by \@endparenv
+% THEN \@doendpe %% \@doendpe redefines \par and \everypar
+% %% to suppress paragraph indentation in
+% FI %% immediately following text
+% IF @ignore = T
+% THEN @ignore :=G F
+% \ignorespaces
+% FI
+% END
+%
+% \@checkend{NAME} ==
+% BEGIN
+% IF \@currenvir = NAME
+% ELSE \@badend{NAME}
+% FI
+% END
+%
+% \end{oldcomments}
+%
+%
+% \begin{macro}{\begin}
+% \changes{LaTeX2.09}{1992/03/18}{Changed \cs{@ignoretrue} to
+% \cs{@ignorefalse} (as documented)}
+% \changes{LaTeX2.09}{1992/08/24}{Added code to \cs{begin} to
+% remember line number. Used by \cs{@badend} to display
+% position of non-matching \cs{begin}.}
+% \changes{v1.1e}{1996/07/26}{remove \cs{global} before \cs{@ignore...}}
+% \begin{macrocode}
+\def\begin#1{%
+ \@ifundefined{#1}%
+ {\def\reserved@a{\@latex@error{Environment #1 undefined}\@eha}}%
+ {\def\reserved@a{\def\@currenvir{#1}%
+ \edef\@currenvline{\on@line}%
+ \csname #1\endcsname}}%
+ \@ignorefalse
+ \begingroup\@endpefalse\reserved@a}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\end}
+% \changes{v1.1e}{1996/07/26}{remove \cs{global} before \cs{@ignore...}}
+% \begin{macrocode}
+\def\end#1{%
+ \csname end#1\endcsname\@checkend{#1}%
+ \expandafter\endgroup\if@endpe\@doendpe\fi
+ \if@ignore\@ignorefalse\ignorespaces\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@checkend}
+% \begin{macrocode}
+\def\@checkend#1{\def\reserved@a{#1}\ifx
+ \reserved@a\@currenvir \else\@badend{#1}\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@currenvline}
+% We do need a default value for |\@currenvline| on top-level since
+% the document environment cancels the brace group. This means that
+% a missmatch with |\begin|\allowbreak|{document}| will not produce
+% a line number. Thus the outer default must be |\@empty| or we
+% will end up with two spaces.
+% \changes{v1.0q}{1994/05/24}{Use \cs{@empty} as outer default}
+% \begin{macrocode}
+\let\@currenvline\@empty
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \subsection{Center, Flushright, Flushleft}
+%
+% \begin{macrocode}
+\message{center,}
+% \end{macrocode}
+%
+% \begin{oldcomments}
+%
+% \center, \flushright and \flushleft set
+% \rightskip = 0pt or \@flushglue (as appropriate)
+% \leftskip = 0pt or \@flushglue (as appropriate)
+% \parindent = 0pt
+% \parfillskip = 0pt. (except \flushleft)
+% \\ == \par \vskip -\parskip
+% \\[LENGTH] == \\ \vskip LENGTH
+% \\* == \par \penalty 10000 \vskip -\parskip
+% \\*[LEN] == \\* \vskip LENGTH
+%
+% They invoke the trivlist environment to handle vertical spacing before
+% and after them.
+%
+% \centering, \raggedright and \raggedleft are the declaration analogs
+% of the above.
+%
+% \raggedright has a more universal effect, however. It sets
+% \@rightskip := flushglue. Every environment, like the list
+% environments,
+% that set \rightskip to its 'normal' value set it to \@rightskip
+%
+% \end{oldcomments}
+%
+% \begin{macro}{\@centercr}
+% \changes{v1.0h}{1994/05/03}{\cs{@badcrerr} replaced by \cs{@nolnerr}}
+% \changes{v1.0z}{1995/07/13}{Use \cs{nobreak}}
+% \begin{macrocode}
+\def\@centercr{\ifhmode \unskip\else \@nolnerr\fi
+ \par\@ifstar{\nobreak\@xcentercr}\@xcentercr}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@xcentercr}
+% \begin{macrocode}
+\def\@xcentercr{\addvspace{-\parskip}\@ifnextchar
+ [\@icentercr\ignorespaces}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@icentercr}
+% \begin{macrocode}
+\def\@icentercr[#1]{\vskip #1\ignorespaces}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{environment}{center}
+% \changes{v0.9h}{1993/12/13}{Removed optional argument of \cs{item}}
+% \changes{v1.0u}{1994/11/12}{Changed end macro to \cs{def}: safer and
+% consistent}
+% We use |\relax| to prevent |\item| scanning too far.
+% \begin{macrocode}
+\def\center{\trivlist \centering\item\relax}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\def\endcenter{\endtrivlist}
+% \end{macrocode}
+% \end{environment}
+%
+% \begin{macro}{\centering}
+% \begin{macrocode}
+\def\centering{%
+ \let\\\@centercr
+ \rightskip\@flushglue\leftskip\@flushglue
+ \parindent\z@\parfillskip\z@skip}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@rightskip}
+% \begin{macrocode}
+\newskip\@rightskip \@rightskip \z@skip
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{environment}{flushleft}
+% \changes{v0.9h}{1993/12/13}{Removed optional argument of \cs{item}}
+% \changes{v1.0u}{1994/11/12}{Changed end macro to \cs{def}: safer and
+% consistent}
+% We use |\relax| to prevent |\item| scanning too far.
+% \begin{macrocode}
+\def\flushleft{\trivlist \raggedright\item\relax}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\def\endflushleft{\endtrivlist}
+% \end{macrocode}
+% \end{environment}
+%
+% \begin{macro}{\raggedright}
+% \begin{macrocode}
+\def\raggedright{%
+ \let\\\@centercr\@rightskip\@flushglue \rightskip\@rightskip
+ \leftskip\z@skip
+ \parindent\z@}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{environment}{flushright}
+% \changes{v0.9h}{1993/12/13}{Removed optional argument of \cs{item}}
+% \changes{v1.0u}{1994/11/12}{Changed end macro to \cs{def}: safer and
+% consistent}
+% We use |\relax| to prevent |\item| scanning too far.
+% \begin{macrocode}
+\def\flushright{\trivlist \raggedleft\item\relax}
+% \end{macrocode}
+%
+% \begin{macrocode}
+\def\endflushright{\endtrivlist}
+% \end{macrocode}
+% \end{environment}
+%
+% \begin{macro}{\raggedleft}
+% \begin{macrocode}
+\def\raggedleft{%
+ \let\\\@centercr
+ \rightskip\z@skip\leftskip\@flushglue
+ \parindent\z@\parfillskip\z@skip}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+\message{verbatim,}
+% \end{macrocode}
+%
+% \subsection{Verbatim}
+%
+%
+% The verbatim environment uses the fixed-width |\ttfamily| font, turns
+% blanks into spaces, starts a new line for each carrige return (or
+% sequence of consecutive carriage returns), and interprets
+% \emph{every} character literally.
+% I.e., all special characters |\, {, $|, etc.
+% are |\catcode|'d to 'other'.
+%
+% The command |\verb| produces in-line verbatim text, where the argument
+% is delimited by any pair of characters. E.g., |\verb #...#| takes
+% `|...|' as its argument, and sets it verbatim in |\ttfamily| font.
+%
+% The *-variants of these commands are the same, except that spaces
+% print as the \TeX{}book's space character instead of as blank spaces.
+%
+% \begin{macro}{\@vobeyspaces}
+% \begin{macrocode}
+{\catcode`\ =\active%
+\gdef\@vobeyspaces{\catcode`\ \active\let \@xobeysp}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@xobeysp}
+% \changes{v1.0z}{1995/07/13}{Use \cs{nobreak}}
+% \changes{v1.1f}{1996/09/28}{Moved to ltspace.dtx}
+% \end{macro}
+%
+%
+% \begin{macro}{\@xverbatim}
+% \begin{macro}{\@sxverbatim}
+% \begin{macrocode}
+\begingroup \catcode `|=0 \catcode `[= 1
+\catcode`]=2 \catcode `\{=12 \catcode `\}=12
+\catcode`\\=12 |gdef|@xverbatim#1\end{verbatim}[#1|end[verbatim]]
+|gdef|@sxverbatim#1\end{verbatim*}[#1|end[verbatim*]]
+|endgroup
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\@verbatim}
+% \changes{LaTeX2.09}{1991/07/24}{Added \cs{penalty}\cs{interlinepenalty}
+% to definition of \cs{par} so that \cs{samepage} works}
+% \changes{v0.9h}{1993/12/13}{Removed optional argument of \cs{item}}
+% Real start of verbatim environment
+% We use |\relax| to prevent |\item| scanning too far.
+% \changes{v0.9p}{1994/01/18}
+% {Add \cs{global}\cs{@inlabelfalse}}
+% \changes{v1.0b}{1994/03/16}
+% {Remove \cs{global}\cs{@inlabelfalse} again.}
+% \begin{macrocode}
+\def\@verbatim{\trivlist \item\relax
+ \if@minipage\else\vskip\parskip\fi
+ \leftskip\@totalleftmargin\rightskip\z@skip
+ \parindent\z@\parfillskip\@flushglue\parskip\z@skip
+% \end{macrocode}
+% \changes{LaTeX2.09}{1991/08/26}{\cs{@@par} added}
+% Added |\@@par| to clear possible |\parshape| definition
+% from a surrounding list (the verbatim guru says).
+% \changes{v0.9p}{1994/01/18}
+% {Only add \cs{penalty} if in hmode}
+% \begin{macrocode}
+ \@@par
+ \@tempswafalse
+ \def\par{%
+ \if@tempswa
+% \end{macrocode}
+% A |\leavevmode| added: needed if, for example, a blank verbatim
+% line is the first thing in a list item (wow!).
+% \changes{v1.0f}{1994/04/29}{\cs{leavevmode} added}
+% \begin{macrocode}
+ \leavevmode \null \@@par\penalty\interlinepenalty
+ \else
+ \@tempswatrue
+ \ifhmode\@@par\penalty\interlinepenalty\fi
+ \fi}%
+% \end{macrocode}
+% To allow customization we hide the font used in a separate macro.
+% \changes{v0.9a}{1993/11/21}{use \cs{verbatim@font} instead of \cs{tt}}
+% \changes{v0.9h}{1993/12/13}{Readded \cs{@noligs}}
+% \changes{v1.1d}{1996/06/03}{Exchanged the following two code lines
+% so that \cs{dospecials} cannot reset the category code
+% of characters handled by \cs{@noligs}.}
+% \changes{v1.1h}{2000/01/07}{Disable hyphenation even if the font allows it.}
+% \begin{macrocode}
+ \let\do\@makeother \dospecials
+ \obeylines \verbatim@font \@noligs
+ \hyphenchar\font\m@ne
+% \end{macrocode}
+% To avoid a breakpoint after the labels box, we remove the penalty
+% put there by the list macros: another use of |\unpenalty|!
+% \changes{v1.0f}{1994/04/29}{Change to \cs{everypar} added}
+% \begin{macrocode}
+ \everypar \expandafter{\the\everypar \unpenalty}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\verbatim}
+% \begin{macro}{\endverbatim}
+% (RmS 93/09/19) Protected against `missing item' error message
+% triggered by empty verbatim environment.
+% \begin{macrocode}
+\def\verbatim{\@verbatim \frenchspacing\@vobeyspaces \@xverbatim}
+\def\endverbatim{\if@newlist \leavevmode\fi\endtrivlist}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\verbatim@font}
+% \changes{v0.9a}{1993/11/21}{Macro added}
+% Macro to select the font used for verbatim typesetting.
+% It also does other work if necessary for the font used.
+% \changes{v0.9s}{1994/01/21}{Removed unnecessary category code
+% hackery.}
+% \begin{macrocode}
+\def\verbatim@font{\normalfont\ttfamily}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{environment}{verbatim*}
+% \begin{macrocode}
+\@namedef{verbatim*}{\@verbatim\@sxverbatim}
+\expandafter\let\csname endverbatim*\endcsname =\endverbatim
+% \end{macrocode}
+% \end{environment}
+%
+% \begin{macro}{\@makeother}
+% \begin{macrocode}
+\def\@makeother#1{\catcode`#112\relax}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\verb@balance@group}
+% \changes{LaTeX2.09}{1993/09/07}
+% {(RmS) Changed definition of \cs{verb} so that it detects a
+% missing second delimiter.}
+% \begin{macrocode}
+\let\verb@balance@group\@empty
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\verb@egroup}
+% \begin{macrocode}
+\def\verb@egroup{\global\let\verb@balance@group\@empty\egroup}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\verb@eol@error}
+% \begin{macrocode}
+\begingroup
+ \obeylines%
+ \gdef\verb@eol@error{\obeylines%
+ \def^^M{\verb@egroup\@latex@error{%
+ \noexpand\verb ended by end of line}\@ehc}}%
+\endgroup
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\verb}
+% \changes{LaTeX2.09}{1992/08/24}
+% {Changed \cs{verb} and \cs{@sverb} to work correctly
+% in math mode}
+% \changes{v0.9a}{1993/11/21}{Use \cs{verbatim@font} instead of
+% \cs{tt}.}
+% \changes{v1.1a}{1995/09/19}{Put \cs{@noligs} after
+% \cs{verbatim@font} where it belongs.}
+% Typesetting a small piece verbatim.
+% \changes{v1.1d}{1996/06/03}{Put setting of verbatim font after
+% \cs{dospecials}
+% so that \cs{dospecials} cannot reset the category code
+% of characters handled by \cs{@noligs}.}
+% \begin{macrocode}
+\def\verb{\relax\ifmmode\hbox\else\leavevmode\null\fi
+ \bgroup
+ \verb@eol@error \let\do\@makeother \dospecials
+ \verbatim@font\@noligs
+ \@ifstar\@sverb\@verb}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\@sverb}
+% \changes{v1.0j}{1994/05/10}{Slight change in error message text.}
+% Definitions of |\@sverb| and |\@verb| changed so |\verb+ foo+|
+% does not lose leading blanks when it comes at the beginning of a line.
+% Change made 24 May 89. Suggested by Frank Mittelbach and Rainer
+% Sch\"opf.
+%
+% \begin{macrocode}
+\def\@sverb#1{%
+ \catcode`#1\active
+ \lccode`\~`#1%
+ \gdef\verb@balance@group{\verb@egroup
+ \@latex@error{\noexpand\verb illegal in command argument}\@ehc}%
+ \aftergroup\verb@balance@group
+ \lowercase{\let~\verb@egroup}}%
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@verb}
+% \begin{macrocode}
+\def\@verb{\@vobeyspaces \frenchspacing \@sverb}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\verbatim@nolig@list}
+% \changes{LaTeX2.09}{1993/09/03}
+% {Replaced \cs{@noligs} by extensible list}
+% \begin{macrocode}
+\def\verbatim@nolig@list{\do\`\do\<\do\>\do\,\do\'\do\-}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\do@noligs}
+% \begin{macrocode}
+\def\do@noligs#1{%
+ \catcode`#1\active
+ \begingroup
+ \lccode`\~`#1\relax
+ \lowercase{\endgroup\def~{\leavevmode\kern\z@\char`#1}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@noligs}
+% To stay compatible with packages that use |\@noligs| we keep it.
+% \changes{v0.9h}{1993/12/13}{Readded \cs{@noligs}}
+% \begin{macrocode}
+\def\@noligs{\let\do\do@noligs \verbatim@nolig@list}
+% \end{macrocode}
+% \end{macro}
+%
+% \changes{v0.9i}{1993/12/16}{\cs{literal} added}
+% \changes{v1.0r}{1994/05/26/16}{\cs{literal} removed}
+% \begin{macrocode}
+%</2ekernel>
+% \end{macrocode}
+%
+% \Finale
+%