% Bugs (sigh) in Computers \& Typesetting

\input manmac
\font\sltt=cmsltt10
\font\niness=cmss9
\font\ninessi=cmssi9
\proofmodefalse
\raggedbottom
\output{\hsize=29pc \onepageout{\unvbox255\kern-\dimen@ \vfil}}

\def\today{\number\day\
  \ifcase\month\or
  Jan\or Feb\or Mar\or Apr\or May\or Jun\or
  Jul\or Aug\or Sep\or Oct\or Nov\or Dec\fi
  \ \number\year}

\def\cutpar{{\parfillskip=0pt\par}}

\def\rhead{Bugs in {\tensl Computers \& Typesetting A, 1996}}
\def\bugonpage#1(#2) \par{\bigbreak\tenpoint
  \hrule width\hsize
  \line{\lower3.5pt\vbox to13pt{}Page #1\hfil(#2)}\hrule width\hsize
  \nobreak\medskip}
\def\buginvol#1(#2) \par{\bigbreak\penalty-1000\tenpoint
  \hrule width\hsize
  \line{\lower3.5pt\vbox to13pt{}Volume #1\hfil(#2)}\hrule width\hsize
  \nobreak\medskip}
\def\slMF{{\manual 89:;}\-{\manual <=>:}} % slant the logo
\def\0{\raise.7ex\hbox{$\scriptstyle\#$}}
\newcount\nn
\newdimen\nsize \newdimen\msize \newdimen\ninept \ninept=9pt
\newbox\eqbox \setbox\eqbox=\hbox{\kern2pt\eightrm=\kern2pt}

\tenpoint
\noindent This is a list of all corrections made to {\sl Computers \&
Typesetting}, Volume~A (also known as {\sl The \TeX book}),
between 1992 and the publication of the final printed
version of that book in September 1996.
\looseness=-1

% volume A

\bugonpage A31, line 8 (3/6/95)

\tenpoint\noindent
\TeX\ begins its error messages with `|!|', and it shows what it was
reading at the\cutpar

\bugonpage A46, line 8 (1/22/95)

\ninepoint\noindent
out for
the occasional times when the adjacent characters |aa|, |ae|, and |o/|
should not be\cutpar

\bugonpage A49, top (9/1/96)

\eightpoint\noindent
[The copy on pages 45 and 46 was significantly shortened
in the seventeenth printing (October 1989 --- see {\tt errata.five}),
and exercise 8.7 moved back to page 48 as a result. But the printer
was not asked to change page 49; hence exercise 8.7 appeared twice,
on pages 48 {\it and\/}~49, during a six-year period.]

\bugonpage A282, lines 11 and 12 (4/18/96)

\ninepoint\noindent
unadorned \<box> command, except that the new box
being appended to the vertical list is also shifted left or right by the
specified amount.

\bugonpage A285, lines 15--17 from the bottom (4/18/96)

\ninepoint
\textindent{$\bull$}|\raise|\<dimen>\<box>, |\lower|\<dimen>\<box>.\enskip
This acts just like an unadorned \<box> command, except that the new box
being appended to the horizontal list is also shifted up or down by the
specified amount.

\bugonpage A290, lines 4--6 from the bottom (4/18/96)

\ninepoint
\textindent{$\bull$}|\raise|\<dimen>\<box>, |\lower|\<dimen>\<box>.\enskip
This acts just like an unadorned \<box> command, except that the new box
being put into the nucleus is also shifted up or down by the specified amount.

\bugonpage A331, bottom two lines (6/25/93)

\ninepoint\noindent
if you know that the
enclosing box is sufficiently small; and |\leaders\vrule\vfill| works fine in
vertical mode.

\bugonpage A354, lines 19--22 (3/5/95)

\ninepoint\noindent
|\def\sett@b{\ifx\next\+\def\nxt{\afterassignment\s@tt@b\let\nxt}%|\par
\noindent
|  \else\let\nxt=\s@tcols\fi|\par\noindent
|  \let\next=\relax \nxt} % turn off \outerness|\par\noindent
|\def\s@tt@b{\let\nxt=\relax \us@false\m@ketabbox}|

\bugonpage A356, lines 13--20 from the bottom (3/5/95)

\ninepoint
{\parindent=0pt
|\def\oalign#1{\leavevmode\vtop{\baselineskip0pt \lineskip.25ex|\par
|  \ialign{##\crcr#1\crcr}}} \def\o@lign{\lineskiplimit=0pt \oalign}|\par
|\def\ooalign{\lineskiplimit=-\maxdimen \oalign} % chars over each other|\par
|\def\sh@ft#1{\dimen0=.00#1ex \multiply\dimen0 by\fontdimen1\font|\par
|  \kern-.0156\dimen0} % compensate for slant in lowered accents|\par
|\def|^|\d||#1{{\o@lign{\relax#1\crcr\hidewidth\sh@ft{10}.\hidewidth}}}|\par
|\def|^|\b||#1{{\o@lign{\relax#1\crcr\hidewidth\sh@ft{29}%|\par
|    \vbox to.2ex{\hbox{\char'26}\vss}\hidewidth}}}|\par
}

\bugonpage A357, lines 7--12 (8/1/95)

\ninepoint\noindent
|\def|^|\rightarrowfill||{$\m@th \smash- \mkern-7mu|\par\noindent
|  \cleaders\hbox{$\mkern-2mu \smash- \mkern-2mu$}\hfill|\par\noindent
|  \mkern-7mu \mathord\rightarrow$}|\par\noindent
|\def|^|\leftarrowfill|%
  |{$\m@th \mathord\leftarrow \mkern-7mu|\par\noindent
|  \cleaders\hbox{$\mkern-2mu \smash- \mkern-2mu$}\hfill|\par\noindent
|  \mkern-7mu \smash-$}|

\bugonpage A357, lines 16--20 (6/25/93)

\ninepoint
{\parindent=0pt
|  \setbox0=\hbox{$\braceld$}%|\par
|  \bracelu\leaders\vrule height\ht0 depth0pt\hfill\bracerd|\par
|  \braceld\leaders\vrule height\ht0 depth0pt\hfill\braceru$}|\par
|\def|^|\downbracefill||{$\m@th|\par
|  \setbox0=\hbox{$\braceld$}%|\par
|  \braceld\leaders\vrule height\ht0 depth0pt\hfill\braceru|\par
|  \bracelu\leaders\vrule height\ht0 depth0pt\hfill\bracerd$}|\par
\smallskip[Also delete lines 21 and 22, as the usage is no longer restricted.]
}

\bugonpage A359, line 25 (3/5/95)

\ninepoint\noindent
|\def|^|\skew||#1#2#3{{\muskip0=#1mu \mkern.5\muskip0|\par\noindent
|    #2{\mkern-.5\muskip0{#3}\mkern.5\muskip0}\mkern-.5\muskip0}{}}|

\bugonpage A360, line 5 from the bottom (3/5/95)

\ninepoint\noindent
|\def\@vereq#1#2{\lower.5pt\vbox{\lineskiplimit\maxdimen \lineskip-.5pt|

\bugonpage A361, lines 19 and 20 (3/5/95)

\ninepoint\noindent
|\def|^|\bmod||{\nonscript\mskip-\medmuskip \mkern5mu|\par\noindent
|  |^|\mathbin||{\rm mod} \penalty900 \mkern5mu \nonscript\mskip-\medmuskip}|

\bugonpage A362, lines 14--18 (3/5/95)

\ninepoint\noindent
|  |^|\everycr||{\noalign{\ifdt@p \global\dt@pfalse|%
  | \ifdim\prevdepth>-1000pt|\par\noindent
|      \vskip-\lineskiplimit \vskip\normallineskiplimit \fi|\par\noindent
|      \else \penalty|^|\interdisplaylinepenalty|| \fi}}}|\par\noindent
|\def\@lign{\tabskip=0pt\everycr={}} % restore inside \displ@y|\par\noindent
|\def|^|\displaylines||#1{\displ@y \tabskip=0pt|

\bugonpage A363, lines 8--9 from the bottom (12/8/89)

{\ninepoint\parindent=0pt
|  \if@mid \dimen@=\ht0 \advance\dimen@ by\dp\z@ |%
 |\advance\dimen@ by12\p@|\parbreak%
|    \advance\dimen@ by\pagetotal \advance\dimen@ by-\pageshrink|
\par}

\bugonpage A364, line 5 from the bottom (4/11/96)

\ninepoint\noindent
|\def\fmtname{plain}|\par\noindent
|\def\fmtversion{3.141592} % identifies the current format|

\bugonpage A374, line 3 (3/7/95)

\ninepoint\indent
|\begingroup\aftergroup\def\aftergroup\asts\aftergroup{|

\bugonpage A410, line 23 (4/18/96)

\ninepoint\noindent
|  Tema con variazione \(su un tema differente)|
\smallskip\eightpoint\noindent
(This implies a corresponding correction to page 411.)

\bugonpage A451, line $16$ (8/8/93)

\ninepoint\noindent
But when plain \TeX\ is tried on the name of a famous ^{Welsh} village,

\bugonpage A462, right column (3/5/95)

\def\cong{\mathrel{\mathpalette\OvOreq\sim}} % congruence sign, index version
\def\OvOreq#1#2{\lower.5pt\vbox{\baselineskip0pt\lineskip-.0pt
    \ialign{$#1\hfil##\hfil$\crcr#2\crcr=\crcr}}}
\eightpoint
|\cong| ( $\cong$ ), 151, $\underline{360}$, 436.

\bugonpage A463, right column (6/25/93)

\eightpoint
direct sum, {\sl see\/} |\oplus|.

\bugonpage A464, left column (6/25/93)

\eightpoint
|\downbracefill| (\hbox to 4em{\downbracefill}), 225--226, $\underline{357}$.

\bugonpage A483, lines 15--21 (4/29/96)

\tenpoint
\begintt
email: {\tt TUG@tug.org}
internet: {\tt http://www.tug.org/}
}
\endtt
Don't delay, subscribe today! That address again is

\smallskip
{\obeylines
\TeX\ Users Group
email: {\tt TUG\char`\@ tug.org}
internet: {\tt http://www.tug.org/}
}

\bye