% \iffalse meta-comment
%
% Copyright (C) 1993-2025
%
% The LaTeX Project and any individual authors listed elsewhere
% in this file.
%
% This file is part of the Standard LaTeX `Tools Bundle'.
% -------------------------------------------------------
%
% It may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3c
% of this license or (at your option) any later version.
% The latest version of this license is in
% https://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
%
% The list of all files belonging to the LaTeX `Tools Bundle' is
% given in the file `manifest.txt'.
%
% \fi
% \iffalse
%%
%% (C) Copyright (C) 1999-2019 Frank Mittelbach
%% All rights reserved.
%%
%<*dtx>
\ProvidesFile{trace.dtx}
%</dtx>
%<package>\NeedsTeXFormat{LaTeX2e}
%<package>\ProvidesPackage{trace}
%<driver>\ProvidesFile{trace.drv}
% \fi
% \ProvidesFile{trace.dtx}
[2021/04/18 v1.1f trace LaTeX code]
%
% \iffalse
%<*driver>
\documentclass{ltxdoc}
\usepackage{doc}
\setcounter{StandardModuleDepth}{1}
\usepackage{shortvrb}
\MakeShortVerb\|
\DeclareRobustCommand\eTeX{\ensuremath{\varepsilon}-\kern-.125em\TeX}
\begin{document}
\DocInput{trace.dtx}
\end{document}
%</driver>
% \fi
%
%
% \GetFileInfo{trace.dtx}
%
% \title{The \textsf{trace} package\thanks{This file
% has version number \fileversion, last
% revised \filedate.}}
% \author{Frank Mittelbach}
% \date{\filedate}
% \MaintainedByLaTeXTeam{tools}
% \maketitle
%
%
%
% \section{Introduction}
%
% When writing new macros one often finds that they do not work as
% expected (at least I do :-). If this happens and one can't
% immediately figure out why there is a problem one has to start doing
% some serious debugging. \TeX{} offers a lot of bells and whistles to
% control what is being traced but often enough I find myself applying
% the crude command |\tracingall| which essentially means ``give me
% whatever tracing information is available''.
%
% In fact I normally use \eTeX{} in such a case, since that \TeX{}
% extension offers me a number of additional tracing possibilities
% which I find extremely helpful. The most important ones are
% |\tracingassigns|, which will show you changes to register values
% and changes to control sequences when they happen, and
% |\tracinggroups|, which will tell you what groups are entered
% or left (very useful if your grouping got out of sync).
%
% So what I really write is
%\begin{verbatim}
% \tracingassigns=1\tracinggroups=1\tracingall
%\end{verbatim}
% That in itself is already a nuisance (since it is a mouthful) but
% there is a worse catch: when using |\tracingall| you do get a awful
% lot of information and some of it is really useless.
%
% For example, if \LaTeX{} has to load a new font it enters some
% internal routines of NFSS which scan font definition tables etc.
% And 99.9\% of the time you are not at all interested in that part of the
% processing but in the two lines before and the five lines
% after. However, you have to scan through a few hundred lines of
% output to find the lines you need.
%
% Another example is the \texttt{calc} package. A simple statement
% like |\setlength| |\linewidth| |{1cm}| inside your macro will result
% in
%
% \renewcommand\MacroFont{\fontencoding\encodingdefault
% \fontfamily\ttdefault
% \fontseries\mddefault
% \fontshape\updefault
% \footnotesize}%
%\begin{verbatim}
% \setlength ->\protect \setlength
% {\relax}
%
% \setlength ->\calc@assign@skip
%
% \calc@assign@skip ->\calc@assign@generic \calc@Askip \calc@Bskip
%
% \calc@assign@generic #1#2#3#4->\let \calc@A #1\let \calc@B #2\expandafter \calc
% @open \expandafter (#4!\global \calc@A \calc@B \endgroup #3\calc@B
% #1<-\calc@Askip
% #2<-\calc@Bskip
% #3<-\linewidth
% #4<-1cm
% {\let}
% {\let}
% {\expandafter}
% {\expandafter}
%
% \calc@open (->\begingroup \aftergroup \calc@initB \begingroup \aftergroup \calc
% @initB \calc@pre@scan
% {\begingroup}
% {\aftergroup}
% {\begingroup}
% {\aftergroup}
%
% \calc@pre@scan #1->\ifx (#1\expandafter \calc@open \else \ifx \widthof #1\expan
% dafter \expandafter \expandafter \calc@textsize \else \calc@numeric \fi \fi #1
% #1<-1
% {\ifx}
% {false}
% {\ifx}
% {false}
%
% \calc@numeric ->\afterassignment \calc@post@scan \global \calc@A
% {\afterassignment}
% {\global}
% {\fi}
% {\fi}
%
% \calc@post@scan #1->\ifx #1!\let \calc@next \endgroup \else \ifx #1+\let \calc@
% next \calc@add \else \ifx #1-\let \calc@next \calc@subtract \else \ifx #1*\let
% \calc@next \calc@multiplyx \else \ifx #1/\let \calc@next \calc@dividex \else \i
% fx #1)\let \calc@next \calc@close \else \calc@error #1\fi \fi \fi \fi \fi \fi \
% calc@next
% #1<-!
% {\ifx}
% {true}
% {\let}
% {\else}
% {\endgroup}
% {restoring \calc@next=undefined}
%
% \calc@initB ->\calc@B \calc@A
% {\skip44}
% {\global}
% {\endgroup}
% {restoring \skip44=0.0pt}
%
% \calc@initB ->\calc@B \calc@A
% {\skip44}
% {\dimen27}
%\end{verbatim}
%
% \noindent Do you still remember what I was talking about?
%
% No? We're trying to find a problem in macro code without having to scan
% too many uninteresting lines. To make this possible we have to
% redefine a number of key commands to turn tracing off temporarily in
% the hope that this will reduce the amount of noise during the
% trace. For example, if we change one of the \texttt{calc} internals
% slightly, the above tracing output can be reduced to:
%
%\begin{verbatim}
% \setlength ->\protect \setlength
% {\relax}
%
% \setlength ->\calc@assign@skip
%
% \calc@assign@skip ->\calc@assign@generic \calc@Askip \calc@Bskip
%
% \calc@assign@generic #1#2#3#4->\let \calc@A #1\let \calc@B #2\expandafter \calc
% @open \expandafter (#4!\global \calc@A \calc@B \endgroup #3\calc@B
% #1<-\calc@Askip
% #2<-\calc@Bskip
% #3<-\linewidth
% #4<-1cm
% {\let}
% {\let}
% {\expandafter}
% {\expandafter}
%
% \calc@open (->\begingroup \conditionally@traceoff \aftergroup \calc@initB \begi
% ngroup \aftergroup \calc@initB \calc@pre@scan
% {\begingroup}
%
% \conditionally@traceoff ->\tracingrestores \z@ \tracingcommands \z@ \tracingpag
% es \z@ \tracingmacros \z@ \tracingparagraphs \z@
% {\tracingrestores}
% {\tracingcommands}
% {restoring \tracingrestores=1}
%
% \calc@initB ->\calc@B \calc@A
% {\skip44}
% {\dimen27}
%\end{verbatim}
%
% \noindent\label{conttraceoffexample}
% Still a lot of noise but definitely preferable to the
% original case.
%
% I redefined those internals that I found most annoyingly
% noisy. There are probably many others that could be treated in a
% similar fashion, so if you think you found one worth adding please
% drop me a short note.
%
% \[ * \quad * \quad * \]
%
% \DescribeMacro\traceon
% \DescribeMacro\traceoff
% The package defines the two macros |\traceon| and |\traceoff| to
% unconditionally turn tracing on or off, respectively. |\traceon| is
% like |\tracingall| but additionally adds |\tracingassigns| and
% |\tracinggroups| if the \eTeX{} program (in extended mode) is
% used. And |\traceoff| will turn tracing off again, a command which
% is already badly missing in plain \TeX{}, since it is often not
% desirable to restrict the tracing using extra groups in the
% document.
%
% \DescribeMacro\conditionally@traceon
% \DescribeMacro\conditionally@traceoff
% There are also two internal macros that turn tracing on and off, but
% only if the user requested tracing in the first place. These are the
% ones that are used internally within the code below.
%
% Since the package overwrites some internals of other packages you
% should load it as the last package in your preamble using
% |\usepackage{trace}|.
%
% The package offers the option \texttt{logonly} that suppresses
% terminal output during tracing (unless |\tracingall| is used). This
% is useful if the \TeX{} implementation used gets rather slow when
% writing a lot of information to the terminal.
%
% It also offers the option \texttt{full} in which case |\traceon|
% will trace all parts of the code, i.e., essentially work like
% |\tracingall|.
%
% \section{A sample file}
%
% The following small test file shows the benefits of the
% \texttt{trace} package. If one uncomments the line loading the
% package, the amount of tracing data will be drastically reduced.
% Without the \texttt{trace} package we get 6594 lines in the log
% file; adding the package will reduce this to 1618 lines.
%
%\begin{verbatim}
% \documentclass{article}
% \usepackage{calc}
% %\usepackage{trace} % uncomment to see difference
%
% \begin{document}
% \ifx\traceon\undefined \tracingall \else \traceon \fi
%
% \setlength\linewidth{1cm}
%
% $foo=\bar a$
%
% \small \texttt{\$} \stop
%\end{verbatim}
%
% \MaybeStop{}
%
% \section{Implementation}
%
% \renewcommand\MacroFont{\fontencoding\encodingdefault
% \fontfamily\ttdefault
% \fontseries\mddefault
% \fontshape\updefault
% \small}
%
% This package is for use with \LaTeX{} (though something similar
% could be produced for other formats).
% \begin{macrocode}
%<*package>
\NeedsTeXFormat{LaTeX2e}[1998/12/01]
% \end{macrocode}
%
% The package has a option that suppresses tracing on the
% terminal, i.e., if used will not set |\tracingonline| to
% one. This has been added in version 1.1a since some \TeX{}
% implementations get rather slow when outputting to a terminal.
% \begin{macrocode}
\DeclareOption{logonly}
{\let\tracingonline@p\z@}
% \end{macrocode}
% The default is showing the tracing information on the terminal.
% \begin{macrocode}
\let\tracingonline@p\@ne
% \end{macrocode}
%
% If the option |full| is selected then all code should be traced,
% i.e., the commands |\conditionally@traceoff| and
% |\conditionally@traceon| should do nothing. We set them to
% |\@empty| not |\relax| since the latter might produce a math ord
% in certain circumstances. We also have to make sure that
% |\traceon| (as defined further down) is not redefining
% |\conditionally@traceoff| again. To make this all work these
% redefinitions have to wait until the end of the package.
% \changes{v1.1c}{2003/04/30}{Option ``full'' added}
% \begin{macrocode}
\DeclareOption{full}
{\AtEndOfPackage{\let\conditionally@traceoff\@empty
\let\conditionally@traceon\@empty
\let\traceon\tr@ce@n
}}
% \end{macrocode}
%
% \begin{macrocode}
\ProcessOptions\relax
% \end{macrocode}
%
%
%
% \begin{macro}{\if@tracing}
% We need a switch to determine if we want any tracing at
% all. Otherwise, if we use |\traceoff|\ldots|\traceon|
% internally, we would unconditionally turn on tracing even when no
% tracing was asked for in the first place.
% \begin{macrocode}
\newif\if@tracing
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\traceon}
% This macro ensures that |\conditionally@traceoff| is actually
% turning off switches (since |\tracingall| might have disabled it)
% and then calls |\tr@ce@n| to setup tracing.
% \begin{macrocode}
\def\traceon{\let\conditionally@traceoff\unconditionally@traceoff
\tr@ce@n}
% \end{macrocode}
% \end{macro}
% \begin{macro}{\tr@ce@n}
% \changes{v1.1c}{2003/04/30}{Macro added}
% \begin{macro}{\conditionally@traceoff}
% As stated in the introduction, the amount of tracing being done
% should depend on the formatter we use. Initially first test if we are
% running with \eTeX{} in extended mode. In the latter case the command
% |\tracinggroups| is defined.
% But for a number of years now \LaTeX{} only works with \eTeX{} so
% we drop that part of the code. For now I leave it in the file
% together with its documentation, but commented out.
% \begin{macrocode}
%\ifx\tracinggroups\undefined
% \end{macrocode}
%
% If we are using standard \TeX{} then |\tr@ce@n| is more or less
% another name for |\tracingall|. The only differences are that we
% set the above |@tracing| switch to true and reorder the
% assignments within it somewhat so that it will output no tracing
% information about itself. In contrast, |\tracingall| itself produces
%
%\begingroup
% \renewcommand\MacroFont{\fontencoding\encodingdefault
% \fontfamily\ttdefault
% \fontseries\mddefault
% \fontshape\updefault
% \footnotesize}%
%\begin{verbatim}
% {vertical mode: \tracingstats}
% {\tracingpages}
% {\tracinglostchars}
% {\tracingmacros}
% {\tracingparagraphs}
% {\tracingrestores}
% {\errorcontextlines}
%
% \showoutput ->\tracingoutput \@ne \showboxbreadth \maxdimen \showboxdepth \maxd
% imen \errorstopmode \showoverfull
% {\tracingoutput}
% {\showboxbreadth}
% {\showboxdepth}
% {\errorstopmode}
%
% \showoverfull ->\tracingonline \@ne
% {\tracingonline}
%\end{verbatim}
%\endgroup
%
% \noindent Which is quite a lot given that none of it is of any
% help to the task at hand. In contrast |\tr@ce@n| will produce
% nothing whatsoever since the noise generating switches are set at
% the very end.
% \begin{macrocode}
% \def\tr@ce@n{%
% \end{macrocode}
% We start by setting the |@tracing| switch to signal that tracing
% is asked for. This is then followed by setting the various
% tracing primitives of \TeX.
% \begin{macrocode}
% \@tracingtrue
% \tracingstats\tw@
% \tracingpages\@ne
% \tracinglostchars\@ne
% \tracingparagraphs\@ne
% \errorcontextlines\maxdimen
% \tracingoutput\@ne
% \showboxbreadth\maxdimen
% \showboxdepth\maxdimen
% \errorstopmode
% \tracingmacros\tw@
% \tracingrestores\@ne
% \tracingcommands\tw@
% \end{macrocode}
% The setting of |\tracingonline| depends on the option
% \texttt{logonly}:
% \begin{macrocode}
% \tracingonline\tracingonline@p
% }
% \end{macrocode}
%
% Now what should |\conditionally@traceoff| do in this case? Should
% it revert all settings changed by |\tr@ce@n|? It should not, since
% our goal is to shorten the trace output, thus setting all of the
% uninteresting values back makes the output unnecessarily
% longer. Therefore we restrict ourselves to those |\tracing...|
% internals that really contribute to listings like the above.
%
% And one additional point is worth mentioning. The order in which
% we turn the tracing internals off has effects on the output we
% see. So what needs to be turned off first? Either
% |\tracingrestores| or |\tracingcommands|; it makes no difference
% which, as long as they both come first. This is because those two
% are the only tracing switches that produce output while tracing
% the command |\conditionally@traceoff| itself (see example on
% page~\pageref{conttraceoffexample}).
%
% In principle we would need to test the |@tracing| switch to see
% if there is anything to turn off; after all, this is the
% conditional trace off. However this would lead to
% extra output if we are currently tracing so we skip the test and
% instead accept that in case we are not doing any tracing we
% unnecessarily set the tracing primitives back to zero (i.e., the
% value they already have).
% \changes{v1.1c}{2003/04/30}{Turn off \cs{tracingoutput}}
% \begin{macrocode}
% \def\conditionally@traceoff{%
% \tracingrestores\z@
% \tracingcommands\z@
% \tracingpages\z@
% \tracingmacros\z@
% \tracingparagraphs\z@
% \tracingoutput\z@
% \showboxbreadth\m@ne
% \showboxdepth\m@ne
% \end{macrocode}
%
% As remarked above there are more tracing switches set by
% |\tr@ce@n|, however there is no point in resetting
% |\tracinglostchars| so we leave it alone.
% \changes{v1.1c}{2003/04/30}{Reset \cs{tracingstats} to one}
% \changes{v1.1f}{2021/04/18}
% {Add \cs{tracingstacklevels} and \cs{tracinglostchars}=3}
% \begin{macrocode}
% \tracingstats\@ne
%% \tracinglostchars\z@
% \end{macrocode}
% Since this is the command that only conditionally turns off
% tracing we do not touch the |@tracing| switch. This way a
% |\conditionally@traceon| will be able to turn the tracing on
% again.
% \begin{macrocode}
% }
% \end{macrocode}
%
% That covers the case for the standard \TeX{} program. If
% |\tracingsgroups| was defined we assume that we are running with
% \eTeX{} in extended mode.
% \begin{macrocode}
%\else
% \end{macrocode}
%
% In that case |\tr@ce@n| does more than |\tracingall|: it also
% turns on tracing of assignments and tracing of
% grouping.\footnote{These are my personal preference settings;
% \eTeX{} does in fact offer some more tracing switches and perhaps
% one or more of them should be added here as well.}
% To keep tracing at a minimum |\tracingassigns| should be turned
% on last (in fact like before we disassemble |\tracingall|
% and reorder it partially).
% \begin{macrocode}
\edef\tr@ce@n{%
\noexpand\@tracingtrue
\tracingstats\tw@
\tracingpages\@ne
\tracinglostchars\thr@@
\tracingparagraphs\@ne
\errorcontextlines\maxdimen
\ifdefined\tracingstacklevels \tracingstacklevels\maxdimen \fi
% \end{macrocode}
% We only change |\tracingoutput| if it hasn't already been enabled by
% |\showoutput|. If that's not the case, we set it to 2 so that we
% can distingush the two cases.
% \changes{v1.1e}{2018/10/13}{Only reset \cs{tracingoutput} if not
% set by \cs{showoutput} earlier}
% \begin{macrocode}
\noexpand\ifnum\tracingoutput=\@ne
\noexpand\else
\tracingoutput\tw@
\showboxbreadth\maxdimen
\showboxdepth\maxdimen
\noexpand\fi
% \end{macrocode}
%
% \begin{macrocode}
\errorstopmode
\tracingmacros\tw@
\tracinggroups\@ne
\tracingrestores\@ne
\tracingcommands\tw@
\tracingassigns\@ne
\tracingonline\tracingonline@p
}
% \end{macrocode}
%
% When turning tracing off again we now also have to turn off those
% additional tracing switches. But what to turn off in what order?
% Since |\tracingassigns| is quite noisy (two lines of output per
% assignment) and the whole command expansion consists of
% assignments, we had best start with this switch and follow it again
% by |\tracingrestores| and |\tracingcommands|. The rest can be in
% any order, it doesn't make a difference.
%
% With the same reasoning as before we omit testing for the
% |@tracing| switch and always set the primitives back to zero.
% \changes{v1.1c}{2003/04/30}{Turn off \cs{tracingoutput}}
% \changes{v1.1c}{2003/04/30}{Reset \cs{tracingstats} to one}
% \changes{v1.1f}{2021/04/18}{Add missing reset of \cs{errorcontextlines}}
% \changes{v1.1f}{2021/04/18}
% {Add \cs{tracingstacklevels} and \cs{tracinglostchars}=3}
% \begin{macrocode}
\edef\conditionally@traceoff{%
\tracingassigns\z@
\tracingrestores\z@
\tracingcommands\z@
\tracingpages\z@
\tracingmacros\z@
% \end{macrocode}
% If |\tracingoutput| is 2 it was set above, if it is 1 it was set
% by |\showoutput| and we leave it alone and if it is 0 there is
% nothing to do as well.
% \changes{v1.1e}{2018/10/13}{Only reset \cs{tracingoutput} if not
% set by \cs{showoutput} earlier}
% \begin{macrocode}
\noexpand\ifnum\tracingoutput=\tw@
\tracingoutput\z@
\showboxbreadth\m@ne
\showboxdepth\m@ne
\noexpand\fi
% \end{macrocode}
%
% \begin{macrocode}
\tracingstats\@ne
\ifdefined\tracingstacklevels \tracingstacklevels\z@ \fi
\errorcontextlines\m@ne
\tracingparagraphs\z@
\tracinggroups\z@
}
% \end{macrocode}
%
% This concludes the part that depends on the formatter being
% used.
% \begin{macrocode}
%\fi
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\unconditionally@traceoff}
% \changes{v1.1c}{2003/04/30}{Macro added}
% A saved version of whatever |\conditionally@traceoff| was defined
% to be. We need this since the latter might get disabled by
% |\tracingall| or by the \texttt{full} option.
% \begin{macrocode}
\let\unconditionally@traceoff\conditionally@traceoff
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\tracingall}
% \changes{v1.1c}{2003/04/30}{Macro added}
% We redefine |\tracingall| to trace the same stuff than |\tr@ce@n| (i.e.,
% more when \eTeX{} is being used) and ensure that everything gets
% traced by disabling |\conditionally@traceoff|. And, of course,
% |\tracingall| should always report on the terminal.
% \begin{macrocode}
\def\tracingall{\let\conditionally@traceoff\@empty
\let\tracingonline@p\@ne
\tr@ce@n
}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\traceoff}
% \begin{macro}{\conditionally@traceon}
% Above we have defined |\conditionally@traceoff| and |\traceon| so
% now we have to define their counterparts.
%
% To stop tracing unconditionally we call
% |\unconditionally@traceoff| and then reset the |@tracing| switch
% to false.
% \begin{macrocode}
\def\traceoff{\unconditionally@traceoff \@tracingfalse}
% \end{macrocode}
%
% Now the |\conditionally@traceon| command will look at the
% |@tracing| switch and if it is true it will call |\traceon| to
% restart tracing (note that the latter command unnecessarily sets
% the switch to true as well). The reason for the |\expandafter| is
% to get rid of the |\fi| primitive which would otherwise show up in
% the tracing output (and perhaps puzzle somebody).
% \begin{macrocode}
\def\conditionally@traceon{\if@tracing \expandafter \traceon \fi}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% The rest of the package now consists of redefinitions of certain
% commands to make use of |\conditionally@traceoff|.
%
% \subsection{Taming \texttt{calc}}
%
% \begin{macro}{\calc@open}
% Near the start of parsing a calc expression the macro |\calc@open|
% is called. Since it already involves a group it is perfectly
% suitable for our task---we don't even have to restart the tracing as
% this is done automatically for us.
% \begin{macrocode}
\def\calc@open({\begingroup
\conditionally@traceoff
\aftergroup\calc@initB
\begingroup\aftergroup\calc@initB
\calc@pre@scan}
% \end{macrocode}
% \end{macro}
%
%
% \subsection{Making NFSS less noisy}
%
% \begin{macro}{\define@newfont}
% Whenever NFSS determines that the font currently asked for is not
% already loaded, it will start looking through font definition
% files and then load the font. This results in a very large number
% of tracing lines which are not normally of interest (unless there
% is a bug in that area---something we hope should have been found
% by now). Again the code already contains its own group so we only
% have to turn the tracing off.
% \begin{macrocode}
\def\define@newfont{%
\begingroup
\conditionally@traceoff
\let\typeout\@font@info
\escapechar\m@ne
\expandafter\expandafter\expandafter
\split@name\expandafter\string\font@name\@nil
\try@load@fontshape % try always
\expandafter\ifx
\csname\curr@fontshape\endcsname \relax
\wrong@fontshape\else
\extract@font\fi
\endgroup}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\frozen@everymath}
% \begin{macro}{\frozen@everydisplay}
% At the beginning of every math formula NFSS will check whether or
% not the math fonts are properly set up and if not will load
% whatever is needed. So we surround that part of the code
% with |\conditionally@traceoff| and |\conditionally@traceon|
% thereby avoiding all this uninteresting output.
% \begin{macrocode}
\frozen@everymath =
{\conditionally@traceoff \check@mathfonts \conditionally@traceon
\the\everymath}
\frozen@everydisplay =
{\conditionally@traceoff \check@mathfonts \conditionally@traceon
\the\everydisplay}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
%
% \section{Checking for italic corrections}
%
% \begin{macro}{\maybe@ic@}
% When executing |\textit| or its friends, \LaTeX{} looks ahead to
% determine whether or not to add an italic correction at the
% end. This involves looping through the |\nocorrlist| which
% outputs a lot of tracing lines we are normally not interested
% in. So we disable tracing for this part of the processing.
% \changes{v1.1d}{2014/04/21}{Use \cs{ifmaybe@ic} not
% \cs{if@tempswa} as the kernel does (pr/4200)}
% \begin{macrocode}
\def \maybe@ic@ {%
\ifdim \fontdimen\@ne\font>\z@
\else
\conditionally@traceoff
\maybe@ictrue
\expandafter\@tfor\expandafter\reserved@a\expandafter:\expandafter=%
\nocorrlist
\do \t@st@ic
\ifmaybe@ic \sw@slant \fi
\conditionally@traceon
\fi
}
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</package>
% \end{macrocode}
%
%
% \Finale
%
% \endinput