path: root/Master/texmf-dist/doc/generic/knuth-errata/errata.four

% 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, 1987--1988}}
\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}

\noindent This is a list of all corrections made to {\sl Computers \&
Typesetting}, Volumes A--E\null, between
16 June 1987 and 20 February 1989. Corrections made to
the softcover version of {\sl The \TeX book} are the same as corrections to
Volume~A\null. Corrections to the softcover version of {\sl The
\slMF\kern1ptbook\/} are the same as corrections to Volume~C\null.
Some of these corrections have already been made in reprintings
of the books. Some of these corrections affect the indexes and
mini-indexes of Volumes B~and~D in ways not shown here. Corrections
made up to 15 June 1987 appear in other files.
% volume A

\bugonpage A159, line 22 (2/15/88)

\ninepoint\noindent
`|\nolimits|' if the normal |\displaylimits|
convention has been overridden; a Rad\cutpar

\bugonpage A213, lines 34--35 (12/23/87)

\ninepoint\noindent
text will be a single control sequence token, defined to be like |\relax| if
its meaning is currently undefined.

\bugonpage A299, line 30 (7/6/88)

\ninepoint\indent\tt
Fatal format file error; I'm stymied.

\bugonpage A326, line 12 (12/12/87)

\ninepoint\noindent
its natural width. The |\hbox| version also invokes |\everymath|.

\bugonpage A359, line 2 (11/6/88)

\ninepoint\noindent
|\mathchardef\ldotp="613A\mathchardef\cdotp="6201\mathchardef\colon="603A|

\bugonpage A359, lines 35--38 (5/24/88)

\ninepoint\noindent
|\def\updownarrow{\delimiter"326C33F } \def\arrowvert{\delimiter"033C000 }|%
 \par\noindent
|\def\Updownarrow{\delimiter"326D377 } \def\Arrowvert{\delimiter"033D000 }  |%
 \par\noindent
|\def\vert{\delimiter"026A30C }        \def\Vert{\delimiter"026B30D }     |%
 \par\noindent
|\def\backslash{\delimiter"026E30F }   \def\bracevert{\delimiter"033E000 }|

\bugonpage A364, line 35 (11/6/88)

\ninepoint\noindent
|\def\fmtname{plain}\def\fmtversion{2.94} % identifies the current format|

\bugonpage A379, line 15 (10/12/87)

\ninepoint
|\def\deleterightmost#1{\edef#1{\expandafter\xyzzy#1\xyzzy}}|

\bugonpage A383, lines 7--15 from the bottom (1/4/89)

\begintt
 209 strings out of 1685
 1659 string characters out of 17636
 27618 words of memory out of 52821
 1172 multiletter control sequences out of 2500
\endtt
Consequently there was plenty of room for more macros: $52821-27618=
25203$ unused cells of main memory, $2500-1172=1328$ of name memory,
$1685-209=1476$ of string memory, and $17636-1659=15977$ of character memory.
But a fairly large \TeX\ was being used, and only the macros of
Appendices B and~E were loaded; in other circumstances it might have
been necessary to conserve space.

\bugonpage A454, lines 23--29 (8/13/87)

\begingroup
\hyphenpenalty=-1000 \pretolerance=-1 \tolerance=1000
\doublehyphendemerits=-100000 \finalhyphendemerits=-100000
\ddanger If a suitable starting letter is found, let it be in font~$f$.
Hyphenation is abandoned unless the |\hyphenchar| of~$f$ is between
0 and~255, and unless a character of that number exists in the font.
If this test is passed, \TeX\ continues to scan forward
until coming to something that's not one of the following three
``admissible items'': (1)~a character in font~$f$ whose |\lccode|
is nonzero; (2)~a ligature formed entirely from characters of type~(1);
(3)~an implicit kern. The first inadmissible item terminates this part of
the process; the trial word consists of all the letters found in admissible
items. Notice that all of these letters are in font~$f$.

\endgroup % end the special hyphenation conventions

\bugonpage A458, left column, line 19 (2/15/88)

\eightpoint\indent
|\|\| ( $\Vert$ ), {\it146--147}, {\it171}, $\underline{361}$, 435, 438.

\bugonpage A462, left column, line 7 (10/9/87)

\eightpoint\indent\qquad 152, 178, $\underline{360}$.

\bugonpage A463, left column (4/17/88)

\eightpoint\indent
\hbox to0pt{\hss\lower1pt\hbox{*}}|\day|, 273, 349, {\it406}.

\bugonpage A464, left column, under Displays (12/8/88)

\eightpoint\indent\quad
non-centered, 186, 326, 375--376, 420--421.

\bugonpage A465, entry for {\tt\char`\\everymath} (12/12/87)

\eightpoint\indent[Include also a reference to page 326.]

\bugonpage A465, right column (7/6/88)

\eightpoint\indent{\tt Fatal format file error}, 299.

\bugonpage A473, entry for `page builder' (8/13/87)

\eightpoint\indent\quad when exercised, 122, 280--283, 286--287.

\bugonpage A474, left column (12/27/88)

\eightpoint\indent
\hbox to0pt{\hss\lower1pt\hbox{*}}|\parshape|, 101--102, 214, 271, 277, 283,

\bugonpage A480, right column (2/15/88)

\eightpoint\indent|\vdots| ( $\vdots$ ), {\it177}, $\underline{359}$.

\bugonpage A481, right column (7/3/87)

\eightpoint|\z@|, $\underline{347}$, 348.\par
|\z@skip|, $\underline{347}$, 348.
% volume B
\hsize=35pc
\def\\#1{\hbox{\it#1\/\kern.05em}} % italic type for identifiers
\def\to{\mathrel{.\,.}} % double dot, used only in math mode

\bugonpage B2, line 32 (2/20/89)

\ninepoint\noindent\hskip10pt
{\bf define} $\\{banner}\equiv\hbox{\tt\char'23}$%
{\tt This\]is\]TeX,\]Version\]2.97\char'23}\quad
$\{\,$printed when \TeX\ starts$\,\}$

\bugonpage B38, lines 7--9 from the bottom (11/6/88)

\tenpoint\noindent[Delete this paragraph; it is being moved to page B214.]

\bugonpage B38, line 5 from the bottom (12/14/88)

\ninepoint\noindent\kern10pt
{\bf begin if\/} \\{log\_opened} {\bf then} $\\{selector}\gets\\{term\_and\_log}$

\bugonpage B39, line 5 (12/14/88)

\ninepoint\noindent\kern50pt
{\bf if\/} \\{log\_opened} {\bf then} \\{error};

\bugonpage B52, line 5 (8/13/87)

\tenpoint\noindent
cannot be done, i.e., if $\\{hi\_mem\_min}=\\{lo\_mem\_max}+1$,
we have to quit.

\bugonpage B54, lines 34--35 (7/9/88)

\ninepoint\noindent\kern10pt
{\bf begin if\/} $\\{hi\_mem\_min}-\\{lo\_mem\_max}\ge1998$
 {\bf then} $t\gets\\{lo\_mem\_max}+1000$\par\noindent\kern10pt
{\bf else} $t\gets\\{lo\_mem\_max}+1+(\\{hi\_mem\_min}-\\{lo\_mem\_max})
\,\mathbin{\bf div}\,2$;\quad\kern-4pt
$\{\,\\{lo\_mem\_max}+2\le t<\\{hi\_mem\_min}\,\}$

\bugonpage B108, new line after line 8 (5/24/88)

\ninepoint\noindent\kern20pt
$d$: \\{integer};\quad
$\{\,$number of characters in incomplete current string$\,\}$

\bugonpage B108, lines 31--33 (5/24/88)

\ninepoint\noindent\kern10pt
$\\{str\_room}(l)$; $d\gets\\{cur\_length}$;\par\noindent\kern10pt
{\bf while} $\\{pool\_ptr}>\\{str\_start}[\\{str\_ptr}]$ {\bf do}
 \par\noindent\kern20pt
{\bf begin} \\{decr}(\\{pool\_ptr});
 $\\{str\_pool}[\\{pool\_ptr}+l]\gets\\{str\_pool}[\\{pool\_ptr}]$;
 \par\noindent\kern20pt
{\bf end};\quad$\{\,$move current string up to make room for another$\,\}$
\par\noindent\kern10pt
{\bf for} $k\gets j$ {\bf to} $j+l-1$ {\bf do} $\\{append\_char}(\\{buffer}[k])$;
\par\noindent\kern10pt
$\\{text}(p)\gets\\{make\_string}$; $\\{pool\_ptr}\gets\\{pool\_ptr}+d$;

\bugonpage B115, line 12 (4/28/88)

\ninepoint\noindent\hskip10pt
$\\{group\_code}=0\to\\{max\_group\_code}$;\quad
 $\{\,$\\{save\_level} for a level boundary$\,\}$

\bugonpage B141, line 19 (4/28/88)

\ninepoint\noindent
\\{par\_token}: \\{halfword};\quad
 $\{\,$token representing `|\par|'$\,\}$

\bugonpage B150, line 24 (4/28/88)

\tenpoint\noindent{\bf 358.\quad}%
The present point in the program is reached only when the \\{expand}
routine has inserted\cutpar

\bugonpage B151, mini-index (4/28/88)

\eightpoint\noindent
Delete the entry for `\\{no\_expand}'; replace it by:

\indent\\{expand}: {\bf procedure}, \S366.

\bugonpage B154, lines 25, 29, 34 respectively (9/20/87)

\ninepoint\noindent\hskip20pt
$\\{cvl\_backup},\\{radix\_backup},\\{co\_backup}$: \\{small\_number};\quad
 $\{\,$to save \\{cur\_val\_level}, etc.$\,\}$\par\noindent\hskip10pt
$\\{co\_backup}\gets\\{cur\_order}$;
 $\\{backup\_backup}\gets\\{link}(\\{backup\_head})$;\par\noindent\hskip10pt
$\\{cur\_order}\gets\\{co\_backup}$;
 $\\{link}(\\{backup\_head})\gets\\{backup\_backup}$;

\bugonpage B155, new entry for mini-index (9/20/87)

\eightpoint\indent
\\{cur\_order}: \\{glue\_ord}, \S447.

\bugonpage B156, line 28 (12/23/87)

\ninepoint\noindent\hskip20pt
{\bf begin }$\\{eq\_define}(\\{cur\_cs},\\{relax},256)$;

\bugonpage B157, mini-index (12/23/87)

\eightpoint\noindent
Delete the entries for `\\{eqtb}' and `\\{frozen\_relax}'; replace them
by the following:

\indent\\{eq\_define}: {\bf procedure}, \S227.\par
$\\{relax}=0$, \S207.\par

\bugonpage B162, lines 12--14 (4/30/88)

\ninepoint\noindent\hskip10pt
{\bf repeat} $\\{link}(\\{temp\_head})\gets\\{null}$;\par\noindent\hskip20pt
{\bf if\/} $(\\{info}(r)>\\{match\_token}+127)\lor
 (\\{info}(r)<\\{match\_token})$ {\bf then}
 $s\gets\\{null}$\par\noindent\hskip20pt
{\bf else begin} $\\{match\_chr}\gets\\{info}(r)-\\{match\_token}$; \
 $s\gets\\{link}(r)$; \ $r\gets s$; \ $p\gets\\{temp\_head}$; \
 $m\gets 0$;

\bugonpage B177, bottom line before mini-index (7/13/88)

\ninepoint\noindent\hskip10pt
$\\{cur\_val}\gets0$; \ 
 $\\{cur\_val\_level}\gets\\{int\_val}$; \
 $\\{radix}\gets0$; \
 $\\{cur\_order}\gets0$;

\bugonpage B181, line 31 (4/28/88)

\ninepoint\noindent
[Change `$x$ units per sp' to `$x$ sp per unit'! This change also
should be made on line~1 of page B183 and line $-8$ of page B590.]

\bugonpage B188, line 8 (5/25/88)

\ninepoint\noindent
{\bf function} $\\{str\_toks}(b:\\{pool\_pointer})$: \\{pointer};\quad
 $\{\,$changes the string \\{str\_pool}$[b\to\\{pool\_ptr}]$ to a token list$\,\}$

\bugonpage B188, line 13 (5/25/88)

\ninepoint\noindent\kern10pt
{\bf begin} \\{str\_room}(1); $p\gets\\{temp\_head}$;
 $\\{link}(p)\gets\\{null}$; $k\gets b$;

\bugonpage B188, line 20 (5/25/88)

\ninepoint\noindent\kern10pt
$\\{pool\_ptr}\gets b$; $\\{str\_toks}\gets p$;

\bugonpage B188, new line after line 28 (5/25/88)

\ninepoint\noindent\kern20pt
$b$: \\{pool\_pointer};\quad$\{\,$base of temporary string$\,\}$

\bugonpage B188, line 31 (5/25/88)

\ninepoint\noindent\kern10pt
{\bf else begin} $\\{old\_setting}\gets\\{selector}$;
 $\\{selector}\gets\\{new\_string}$; $b\gets\\{pool\_ptr}$;

\bugonpage B188, line 41 (5/25/88)

\ninepoint\noindent\kern20pt
$\\{selector}\gets\\{old\_setting}$; $\\{the\_toks}\gets\\{str\_toks}(b)$;

\bugonpage B190, lines 16--18 (5/25/88)

\ninepoint\noindent\kern20pt
$b$: \\{pool\_pointer};\quad$\{\,$base of temporary string$\,\}$\par
\noindent\kern10pt
{\bf begin} $c\gets\\{cur\_chr}$;
 $\langle\,$Scan the argument for command $c${\eightrm\kern.5em471}$\,\rangle$;
\par\noindent\kern10pt
$\\{old\_setting}\gets\\{selector}$;
$\\{selector}\gets\\{new\_string}$; $b\gets\\{pool\_ptr}$;
$\langle\,$Print the result of command~$c${\eightrm\kern.5em472}$\,\rangle$;
\par\noindent\kern10pt
$\\{selector}\gets\\{old\_setting}$;
$\\{link}(\\{garbage})\gets\\{str\_toks}(b)$;
$\\{ins\_list}(\\{link}(\\{temp\_head}))$;

\bugonpage B210, line 36 (5/25/88)

\ninepoint\noindent\kern10pt
{\bf begin if} $(\\{pool\_ptr}+\\{name\_length}>\\{pool\_size})
 \lor(\\{str\_ptr}=\\{max\_strings})\lor(\\{cur\_length}>0)$ {\bf then}

\bugonpage B211, new line of code before the mini-index (12/14/88)

\ninepoint\noindent
\\{log\_opened}: \\{boolean};\quad$\{\,$has the transcript file been opened?$\,\}$

\bugonpage B212, line 5 (12/14/88)

\ninepoint\noindent\kern10pt
$\\{job\_name}\gets0$; \ $\\{name\_in\_progress}\gets\\{false}$; \
$\\{log\_opened}\gets\\{false}$;

\bugonpage B213, line 24 (12/14/88)

\ninepoint\noindent\kern10pt
$\\{log\_name}\gets\\{a\_make\_name\_string}(\\{log\_file})$; \
$\\{selector}\gets\\{log\_only}$; \
$\\{log\_opened}\gets\\{true}$;

\bugonpage B214, lines 2 and 3 (12/14/88)

\tenpoint\noindent
messages or even to \\{show\_context}.
The \\{prompt\_file\_name} routine can result in a \\{fatal\_error},
but the \\{error}
routine will not be invoked because \\{log\_opened} will be false.
\par\noindent\hskip10pt
The normal idea of \\{batch\_mode} is that nothing at all should be written
on the terminal. However, in the unusual case that
no log file could be opened, we make an exception and allow
an explanatory message to be seen.

\bugonpage B214, lines 7--11 reduce to a single line (12/14/88)

\ninepoint\noindent\hskip10pt
{\bf begin} $\\{selector}\gets\\{term\_only}$;

\bugonpage B224, second-last line (4/28/87)

\ninepoint\noindent
\\{done}: {\bf if} \\{file\_opened} {\bf then} \\{b\_close}(\\{tfm\_file});\par
\noindent\hskip10pt $\\{read\_font\_info}\gets g$;

\bugonpage B229, lines 6--8 (11/17/87)

\tenpoint\noindent
than $2^{27}$.
If $z<2^{23}$, the individual multiplications $b\cdot z$,
$c\cdot z$, $d\cdot z$ cannot overflow; otherwise we will divide $z$ by 2,
4, 8, or 16, to obtain a multiplier less than $2^{23}$, and we can
compensate for this later. If $z$ has thereby been replaced by
$z^\prime=z/2^e$, let $\beta=2^{4-e}$; we shall compute

\bugonpage B229, lines 11--12 (11/17/87)

\tenpoint\noindent
if $a=0$, or the same quantity minus $\alpha=2^{4+e}z^\prime$ if $a=255$.
This calculation must be done exactly, in order to guarantee portability
of \TeX\ between computers.

\bugonpage B230, lines 2--5 (11/17/87)

\ninepoint
\noindent\hskip10pt{\bf begin} $\\{alpha}\gets16$;\par
\noindent\hskip10pt{\bf while} $z\ge\oct{40000000}$ {\bf do}\par
\noindent\hskip20pt{\bf begin} $z\gets z\ {\bf div}\ 2$; \
 $\\{alpha}\gets\\{alpha}+\\{alpha}$; \ {\bf end};\par
\noindent\hskip10pt$\\{beta}\gets256\ {\bf div}\ \\{alpha}$; \
 $\\{alpha}\gets\\{alpha}\ast z$;\par

\bugonpage B245, new entry for mini-index (8/7/87)

\eightpoint\indent
\\{cur\_s}: \\{integer}, \S616.

\bugonpage B254, line 29 (8/7/87)

\ninepoint\noindent
\\{cur\_s}:  \\{integer};\quad
$\{\,$current depth of output box nesting, initially $-1\,\}$

\bugonpage B254, line 31 (8/7/87)

\ninepoint\noindent
[Remove the statement `$\\{cur\_s}\gets-1$;' and put it on page B244 at the
end of line 31.]

\bugonpage B259, line 13 (11/9/87)

\ninepoint\noindent\hskip20pt
{\bf begin }$\\{rule\_wd}\gets\\{rule\_wd}+10$;\quad
$\{\,$compensate for floating-point rounding$\,\}$\par\noindent\hskip20pt
$\\{edge}\gets\\{cur\_h}+\\{rule\_wd}$; $\\{lx}\gets0$;
$\langle\,$Let \\{cur\_h} be the position of the first box, and set

\bugonpage B259, line 17 (11/9/87)

\ninepoint\noindent\hskip20pt
$\\{cur\_h}\gets\\{edge}-10$; {\bf goto} \\{next\_p};

\bugonpage B263, line 21 (11/9/87)

\ninepoint\noindent\hskip20pt
{\bf begin }$\\{rule\_ht}\gets\\{rule\_ht}+10$;\quad
$\{\,$compensate for floating-point rounding$\,\}$\par\noindent\hskip20pt
$\\{edge}\gets\\{cur\_v}+\\{rule\_ht}$; $\\{lx}\gets0$;
$\langle\,$Let \\{cur\_v} be the position of the first box, and set

\bugonpage B263, line 25 (11/9/87)

\ninepoint\noindent\hskip20pt
$\\{cur\_v}\gets\\{edge}-10$; {\bf goto} \\{next\_p};

\bugonpage B266, line 8 (8/7/87)

\ninepoint\noindent\hskip10pt
\\{dvi\_out}(\\{eop}); \\{incr}(\\{total\_pages}); $\\{cur\_s}\gets-1$;

\bugonpage B266, new code between lines 31 and 32 (8/7/87)

\ninepoint
\noindent\hskip10pt{\bf while} $\\{cur\_s}>-1$ {\bf do}\par
\noindent\hskip20pt{\bf begin if} $\\{cur\_s}>0$ {\bf then}
  \\{dvi\_out}(\\{pop})\par
\noindent\hskip20pt{\bf else begin} \\{dvi\_out}(\\{eop});
  \\{incr}(\\{total\_pages})\par
\noindent\hskip30pt{\bf end};\par
\noindent\hskip20pt\\{decr}(\\{cur\_s});\par
\noindent\hskip20pt{\bf end};\par

\bugonpage B285, line 21 (4/28/88)

\noindent\tenpoint
is subsidiary to the \\{nucleus} field of some noad; the dot is replaced by
`|_|' or `|^|' or `|/|' or `|\|' if $p$ is\cutpar

\bugonpage B338, second-last line (8/19/87)

\ninepoint\noindent\kern10pt
$q\gets\\{link}(\\{head})$; $s\gets\\{head}$;

\bugonpage B339, line 4 (8/19/87)

\ninepoint\noindent\kern20pt
$s\gets q$; $q\gets\\{link}(q)$;

\bugonpage B339, new code to insert after line 10 (8/19/87)

\ninepoint
\noindent\kern10pt{\bf if} $o\ne0$ {\bf then}\par
\noindent\kern20pt{\bf begin} $r\gets\\{link}(q)$; $\\{link}(q)\gets\\{null}$;
 $q\gets\\{hpack}(q,\\{natural})$;\par
\noindent\kern20pt$\\{shift\_amount}(q)\gets o$; $\\{link}(q)\gets r$;
 $\\{link}(s)\gets q$;\par
\noindent\kern20pt{\bf end};\par
\noindent[These new lines also imply changes to the index that aren't
 shown in this errata list.]

\bugonpage B387, line 2 (5/24/88)

\tenpoint\noindent
is quite short. In the following code we set \\{hc}$[\\{hn}+2]$ to the
impossible value 128, in order to\cutpar

\bugonpage B387, line 8 (5/24/88)

\ninepoint\noindent\kern10pt
$\\{hc}[0]\gets127$; $\\{hc}[\\{hn}+1]\gets127$;
 $\\{hc}[\\{hn}+2]\gets128$;\quad$\{\,$insert delimiters$\,\}$

\bugonpage B390, lines 17--18 (5/24/88)

\ninepoint\noindent\kern10pt
$\langle\,$Enter as many hyphenation exceptions as are listed, until coming
 to a right brace; then {\bf return\eightrm\kern.5em961}$\,\rangle$;

\smallskip[The same change applies to lines 20--21, and
to page~582.]

\bugonpage B396, new line after line 34 (5/24/88)

\ninepoint\noindent\kern10pt
$\\{trie\_link}(\\{trie\_size})\gets0$;
$\\{trie\_back}(0)\gets\\{trie\_size}$;\quad
$\{\,$wrap around$\,\}$

\bugonpage B396, bottom line (12/12/87)

\ninepoint\noindent\hskip10pt
$\\{trie\_link}(0)\gets0$; $\\{trie\_char}(0)\gets0$;
 $\\{trie\_op}(0)\gets\\{min\_quarterword}$;

\bugonpage B397, lines 15--17 (5/24/88)

\ninepoint\noindent\kern10pt
{\bf begin} $c\gets\\{trie\_c}[p]$;\par\noindent\kern10pt
{\bf if} $c<\\{trie\_min}$ {\bf then} $\\{trie\_min}\gets c$;\par\noindent\kern10pt
{\bf if} $\\{trie\_min}=0$ {\bf then} $z\gets\\{trie\_link}(\\{trie\_size})$\par
\noindent\kern10pt
{\bf else} $z\gets\\{trie\_link}(\\{trie\_min}-1)$;\quad
$\{\,$get the first conceivably good hole$\,\}$

\bugonpage B400, lines 3--4 (5/24/88)

\ninepoint\noindent
$\langle\,$Enter all of the patterns into a linked trie, until coming
 to a right brace{\eightrm\kern.5em961}$\,\rangle\equiv$

\smallskip[The same change applies to page B399, lines 29--30, and
to page~582.]

\bugonpage B402, line 10 (5/24/88)

\ninepoint\noindent\kern10pt
$r\gets\\{trie\_size}$;\quad
$\{\,$finally, we will zero out the holes$\,\}$

\bugonpage B406, line 9 from the bottom (1/23/89)

\ninepoint\noindent\kern30pt
$\\{shrink\_order}(r)\gets\\{normal}$; \ $\\{delete\_glue\_ref}(q)$; \
$\\{glue\_ptr}(p)\gets r$; \ $q\gets r$;

\bugonpage B417, line 10 (1/23/89)

\ninepoint\noindent\kern10pt
$q\gets\\{new\_skip\_param}(\\{top\_skip\_code})$; \quad
$\{\,$now $\\{temp\_ptr}=\\{glue\_ptr}(q)\,\}$

\bugonpage B418, line 14 (1/23/89)

\ninepoint\noindent\kern30pt
$\\{shrink\_order}(r)\gets\\{normal}$; \ $\\{delete\_glue\_ref}(q)$; \
$\\{glue\_ptr}(p)\gets r$; \ $q\gets r$;

\bugonpage B507, line 13 (12/14/88)

\ninepoint\noindent\kern10pt
{\bf if\/} \\{log\_opened} {\bf then} $\\{selector}\gets\\{selector}+2$;

\bugonpage B527, line 21 (12/14/88)

\ninepoint\noindent\kern10pt
{\bf if\/} \\{log\_opened} {\bf then}

\bugonpage B528, line 5 (12/14/88)

\ninepoint\noindent\kern10pt
{\bf if\/} \\{log\_opened} {\bf then}

\bugonpage B547, right column (9/20/87)

\eightpoint
\leftline{\\{co\_backup}:\quad $\underline{366}$.}

\bugonpage B548, right column (9/20/87)

\eightpoint
\leftline{\\{cur\_order}:\quad 366, $\underline{447}$, 448, 454, 462.}

\bugonpage B548, right column (8/7/87)

\eightpoint
\leftline{\\{cur\_s}:\quad 593, $\underline{616}$, 619, 629, 640, 642.}

\bugonpage B551, both columns (12/23/87)

\eightpoint[Remove `372' from \\{eqtb} and put it into \\{eq\_define}.]

\bugonpage B552, left column (4/28/88)

\eightpoint[Insert `358' into \\{expand}.]

\bugonpage B554, left column (12/23/87)

\eightpoint[Remove `372' from \\{frozen\_relax}.]

\bugonpage B559, new entry (12/14/88)

\eightpoint\noindent
\\{log\_opened}, 92--93, $\underline{527}$, 528, 534--535, 1265, 1333--1334.

\bugonpage B559, right column (8/13/87)

\eightpoint[Delete the entry for \\{low\_mem\_max}.]

\bugonpage B562, left column (4/28/88)

\eightpoint[Remove `358' from \\{no\_expand}.]

\bugonpage B565, left column (8/7/87)

\eightpoint
\leftline{\\{pop}:\quad 584--585, $\underline{586}$, 590, 601, 608, 642.}

\bugonpage B567, left column (12/23/87)

\eightpoint[Insert `372' into \\{relax}.]

\bugonpage B568, left column (4/28/88)

\eightpoint[Move `269' from \\{save\_index} to \\{save\_level}.]
% volume C
\hsize=29pc
\def\\#1{\hbox{\it#1\/\kern.05em}} % italic type for identifiers

\bugonpage C26, bottom line (7/18/87)

\tenpoint\noindent
What angle corresponds to the direction North-Northwest?

\bugonpage C107, line 13 (10/7/87)

{\bf pickup penrazor} xscaled \\{heavyline}
  rotated (angle$(z_{32}-z_{31})+90$);

\bugonpage C164, line 10 (4/27/88)

\ninepoint\indent
\quad $y_{\$c}=\\{top}\,y_{\$l}$; \ $y_{\$d}=y_{\$r}$; \
 $x_{\$c}=x_{\$l}-\\{left\_jut}$; \ $x_{\$d}=x_{\$r}+\\{right\_jut}$;

\bugonpage C175, line 23 (1/11/88)

\ninepoint\noindent
expand into a sequence of tokens. \
(The language {\eightrm{SIMULA67}} demonstrated that it is\cutpar

\bugonpage C241, line 11 (5/25/88)

\ninepoint\indent
{\bf numeric} $\\{ht}\0,\\{dp}\0$; \
 $\\{ht}\0=\\{body\_height}\0$; \
 $.5[\\{ht}\0,-\\{dp}\0]=\\{axis}\0$;

\bugonpage C248, line 21 becomes two lines (1/24/89)

\ninepoint\noindent
which might not
be numerically stable in the presence of rounding errors.)
Another case, not really desirable, is $\\{left\_jut}=\\{right\_jut}=0$.

\bugonpage C262, line 15 (12/23/88)

\ninepoint\noindent
|string base_name, base_version; base_name="plain"; base_version="1.7";|

\bugonpage C271, line 12 (1/4/89)

\ninepoint\noindent
the user and \MF's primitive picture commands.
First, some important program\cutpar

\bugonpage C271, line 4 from the bottom (12/23/88)

\ninepoint\noindent
|def |^|cutdraw|| expr p = % caution: you may need autorounding=0|

\bugonpage C272, lines 5 and 6 (12/23/88)

\ninepoint\noindent
|  (cut_ scaled (1+max(pen_lft,pen_rt,pen_top,pen_bot))|\par\noindent
|   rotated theta shifted z)t_;|

\bugonpage C273, lines 20 and 22 (9/26/88)

\ninepoint\noindent
|  (z_+(0,pen_top))t_=round((z+(0,pen_top))t_); z_ enddef;|\par\noindent
|  (z_+(0,pen_bot))t_=round((z+(0,pen_bot))t_); z_ enddef;|

\bugonpage C290, line 6 from the bottom (12/23/88)

\ninepoint\noindent
(2)~A throwaway variable,
`\\{whatever}', nullifies an unwanted equation at the beginning\cutpar

\bugonpage C331, just below the illustration (7/18/87)

\ninepoint\noindent
Such a pattern is, of course, rather unlikely to occur in a |gf| file,
but |GFtoDVI| would\cutpar

\bugonpage C337, line 11 (4/28/88)

\ninepoint
An online ``menu'' of the available test routines will be typed at your
terminal\cutpar

\bugonpage C346, entry for {\tt autorounding} (12/23/88)

\eightpoint\indent\hskip20pt
212, {\it262}, {\it264}, 271--272.

\bugonpage C350, left column (7/6/88)

\eightpoint\indent
|Fatal| |base| |file| |error|, 226.

\bugonpage C356, left column (1/11/88)

\eightpoint
SIMULA67 language, 175.

\bugonpage C358, right column (2/15/88)

\eightpoint\indent\hbox to0pt{\hss\lower1pt\hbox{*}}%
|yoffset|, 212, $\underline{220}$, 315, 324.
% Volume D
\hsize=35pc
\def\\#1{\hbox{\it#1\/\kern.05em}} % italic type for identifiers
\def\to{\mathrel{.\,.}} % double dot, used only in math mode

\bugonpage D2, line 27 (12/14/88)

\ninepoint\noindent\hskip10pt
{\bf define} $\\{banner}\equiv\hbox{\tt\char'23}$%
{\tt This\]is\]METAFONT,\]Version\]1.7\char'23}\quad
$\{\,$printed when \MF\ starts$\,\}$

\bugonpage D36, lines 3--5 (11/6/88)

\tenpoint\noindent[Delete this paragraph; it is being moved to page D349.]

\bugonpage D36, line 7 (12/14/88)

\ninepoint\noindent\kern10pt
{\bf begin if\/} \\{log\_opened} {\bf then} $\\{selector}\gets\\{term\_and\_log}$

\bugonpage D36, line 16 (12/14/88)

\ninepoint\noindent\kern50pt
{\bf if\/} \\{log\_opened} {\bf then} \\{error};

\bugonpage D66, lines 34--35 (7/9/88)

\ninepoint\noindent\kern10pt
{\bf begin if\/} $\\{hi\_mem\_min}-\\{lo\_mem\_max}\ge1998$
 {\bf then} $t\gets\\{lo\_mem\_max}+1000$\par\noindent\kern10pt
{\bf else} $t\gets\\{lo\_mem\_max}+1+(\\{hi\_mem\_min}-\\{lo\_mem\_max})
\,\mathbin{\bf div}\,2$;\quad\kern-4pt
$\{\,\\{lo\_mem\_max}+2\le t<\\{hi\_mem\_min}\,\}$

\bugonpage D347, new line of code after line 5 (12/14/88)

\ninepoint\noindent
\\{log\_opened}: \\{boolean};\quad$\{\,$has the transcript file been opened?$\,\}$

\bugonpage D347, line 11 (12/14/88)

\ninepoint\noindent\kern10pt
$\\{job\_name}\gets0$; \
$\\{log\_opened}\gets\\{false}$;

\bugonpage D348, line 4 from the bottom (12/14/88)

\ninepoint\noindent\kern10pt
$\\{log\_name}\gets\\{a\_make\_name\_string}(\\{log\_file})$; \
$\\{selector}\gets\\{log\_only}$; \
$\\{log\_opened}\gets\\{true}$;

\bugonpage D349, lines 6 and 7 (12/14/88)

\tenpoint\noindent
print error messages or even to \\{show\_context}.
The \\{prompt\_file\_name} routine can result in a \\{fatal\_error},
but the \\{error}
routine will not be invoked because \\{log\_opened} will be false.
\par\noindent\hskip10pt
The normal idea of \\{batch\_mode} is that nothing at all should be written
on the terminal. However, in the unusual case that
no log file could be opened, we make an exception and allow
an explanatory message to be seen.

\bugonpage D349, lines 11--15 reduce to a single line (12/14/88)

\ninepoint\noindent\hskip10pt
{\bf begin} $\\{selector}\gets\\{term\_only}$;

\bugonpage D420, bottom line (5/25/88)

\ninepoint\noindent\kern30pt
{\bf if\/} \\{txx} {\bf mod} $\\{unity}=0$ {\bf then}

\bugonpage D441, delete line 2 and change line 12 as follows (5/25/88)

\ninepoint\noindent
\\{done}: {\bf if} $\\{eq\_type}(x)\ne\\{tag\_token}$ {\bf then}
 $\\{clear\_symbol}(x,\\{false})$;\par\noindent\kern10pt
{\bf if} $\\{equiv}(x)=\\{null}$ {\bf then} $\\{new\_root}(x)$;
\par\noindent\kern10pt
$\\{scan\_declared\_variable}\gets h$;

\bugonpage D444, line 8 from the bottom (12/14/88)

\ninepoint\noindent\kern10pt
{\bf if\/} \\{log\_opened} {\bf then} $\\{selector}\gets\\{selector}+2$;

\bugonpage D510, line 14 (12/14/88)

\ninepoint\noindent\kern10pt
{\bf if\/} \\{log\_opened} {\bf then}

\bugonpage D511, line 11 (12/14/88)

\ninepoint\noindent\kern10pt
{\bf if\/} \\{log\_opened} {\bf then}

\bugonpage D530, new entry (12/14/88)

\eightpoint\noindent
\\{log\_opened}, 87--88, $\underline{782}$, 783, 788--789, 1023, 1205, 1208.

\bugonpage D545, left column (10/31/87)

\eightpoint
\leftline{{\bf zscaled} primitive:\quad $\underline{893}$.}
\leftline{Zabala Salelles, Ignacio Andres:\quad 812.}

% volume E
\hsize=29pc
\def\dashto{\mathrel{\hbox{-\kern-.05em}\mkern3.9mu\hbox{-\kern-.05em}}}

\bugonpage E32, second-last line (9/20/87)

\tenpoint\noindent
after which comes `\\{math\_axis}\0; {\bf generate} |mathsy|' (which we
won't bother to\cutpar

\bugonpage E111, line 29 (10/16/88)

\ninepoint\noindent
$\\{lft}\,x_{11}={\rm hround}\,u$; \
 $x_{1l}-x_{11}=x_{2l}-x_{12}=x_{22}-x_{2r}={\rm hround}\,1.6\\{cap\_jut}$;

\bugonpage E285, bottom line (12/1/87)

\rightline{\eightssi Due to Technical Developments\/\enspace\eightss(1968)}

\bugonpage E333, lines 9--11 (1/9/89)

\ninepoint\noindent
$\\{lft}\,x_{1l}={\rm hround}(2.5u-.5\\{mfudged.stem})$; \
 $x_{1l}=x_{1'l}=x_{2l}=x_{2'l}$;\par\noindent
$\\{lft}\,x_{3l}={\rm hround}(.5w-.5\\{mfudged.stem})$; \
 $x_5-x_3=x_3-x_1$;\par
\line{{\bf if\/} not \\{monospace}: 
 $r:={\rm hround}(x_5+x_1)+r-w$; {\bf fi}\hfill
 \% change width for better fit}

\bugonpage E353, lines 38--39 (8/12/87)

\ninepoint
\leftline{\kern10pt{\bf else}: {\bf fill} \\{diag\_end}$(6r,5r,1,1,5l,6l)
 \dashto.9[z_{5l},z_{6l}]$}
\line{\kern30pt$.\,.\,\{z_5-z_6\}\,.1[z_{5r},z_{6r}]\dashto\rm cycle$;\hfil
 \% middle stem}

\bugonpage E387, line 13 (8/12/87)

\ninepoint
\line{\kern10pt{\bf pickup} \\{tiny}.\\{nib}; \ \\{bulb}$(3,4,5)$;\hfil\% bulb}

\bugonpage E413, lines 37--38 (8/12/87)

\ninepoint
\leftline{\kern10pt{\bf else}: {\bf fill} \\{diag\_end}$(6r,5r,1,1,5l,6l)
 \dashto.9[z_{5l},z_{6l}]$}
\line{\kern30pt$.\,.\,\{z_5-z_6\}\,.1[z_{5r},z_{6r}]\dashto\rm cycle$;\hfil
 \% middle stem}

\bugonpage E459, line 24 (8/7/87)

\ninepoint\noindent[Delete the `$=$' sign between `\\{lft}' and `$x_5$'.]

\bugonpage E471, line 5 (12/11/88)

\ninepoint\noindent
$x_2=\\{good}.x\,.5w$; \ $\\{center\_on}(x_2)$;

\bugonpage E471, insert two lines below the rule at bottom of page (12/11/88)

\ninepoint
\line{{\bf def\/}
\\{center\_on}({\bf expr} $x) =\null$
{\bf if\/} not \\{monospace}:\hfill \% change width for symmetric fit}
\leftline{\kern10pt
 $r:=r+2x-w$; \ $w:=2x$; \ {\bf fi} {\bf enddef};}

\bugonpage E477, line 20 (12/11/87)

\ninepoint\noindent
$x_4=x_8=\\{good}.x\,.5w$; \ $\\{center\_on}(x_4)$; \
$x_2=w-x_6=\\{good}.x(x_4+a)$;

\bugonpage E483, third line of elementary division operator (12/11/88)

\ninepoint\noindent
$x_3-.5\\{dot\_size}={\rm hround}(.5w-.5\\{dot\_size})$; \
$\\{center\_on}(x_3)$;

\bugonpage E485, line 4 (8/7/87)

\ninepoint\noindent[Delete the `$=$' sign between `\\{lft}' and `$x_5$'.]

\bugonpage E487, line 17 (8/4/88)

\ninepoint\line{%
{\bf fill} \\{fullcircle} scaled$\,(\\{bold}+3.8\\{dw}+\\{eps})\,$%
 shifted$\,(.5[z_4,z_8])$;\hfill\% dot}
\smallskip\noindent[Also remove page 487 from the index entry for
\\{dot\_size}, and add it to the entries for \\{bold} and \\{dw}.]

\bugonpage E515, lines 5 and 12 (12/11/88)

\ninepoint\noindent
$.5[x_1,x_2]=x_3=\\{good}.x\,.5w$; \
$\\{center\_on}(x_3)$; \ $\\{lft}\,x_1={\rm hround}(.5w-u*{\rm sqrt}48)$;

\bugonpage E515, line 21 (1/23/89)

\ninepoint\noindent
{\bf labels}$(5,6)$; \ \\{zero\_width}; \ {\bf endchar\/};
\smallskip\noindent[Also put labels `{\tt5}' and `{\tt6}' on the
upper right figure, page E514.]

\bugonpage E521, lines 4 and 14 (12/12/88)

\ninepoint\noindent
$x_1=x_2=\\{good}.x\,.5w$; \
$\\{center\_on}(x_1)$; \ $\\{lft}\,x_3={\rm hround}\,u$; \ $x_4=w-x_3$;

\bugonpage E537, line 6 (12/11/88)

\ninepoint\noindent
$x_1=x_2=x_3=x_4$; \
$x_1-.5\\{stem}={\rm hround}(.5w-.5\\{stem})$; \
$\\{center\_on}(x_1)$;

\bugonpage E537, line 19 (12/11/88)

\ninepoint\noindent
$x_1=x_2=x_3$; \
$x_1-.5\\{stem}={\rm hround}(.5w-.5\\{stem})$; \
$\\{center\_on}(x_1)$;

\bugonpage E539, line 4 (12/11/88)

\ninepoint\noindent
$x_1=x_4=x_{30}=x_{33}=\\{good}.x\,.5w$; \ $\\{center\_on}(x_1)$;

\bugonpage E539, line 21 (12/11/88)

\ninepoint\noindent
$x_1=x_4=\\{good}.x\,.5w$; \ $\\{center\_on}(x_1)$;

\bugonpage E541, line 4 (12/11/88)

\ninepoint\noindent
$x_1=x_5=\\{good}.x\,.5w$; \ $\\{center\_on}(x_1)$;

\bugonpage E541, line 17 (12/11/88)

\ninepoint\noindent
$x_1=x_{10}=\\{good}.x\,.5w$; \ $\\{center\_on}(x_1)$;

\bugonpage E550, new line after line 23 (8/15/87)

\ninepoint\noindent\kern10pt
{\bf forsuffixes} $\hbox{\$}=\\{notch\_cut},\\{cap\_notch\_cut}$:
 {\bf if\/} $\hbox{\$}<3$: $\hbox{\$}:=3$; {\bf fi endfor}
\smallskip\noindent
[To make room for this, combine lines 38 and 39 into a single line.]

\bugonpage E550, line 29 (7/9/88)

\ninepoint\noindent\hskip10pt
{\bf \def\_{\kern.04em\vbox{\hrule width.3em height .6pt}\kern.08em}%
define\_whole\_vertical\_blacker\_pixels}$(\\{vair},\\{bar},\\{slab},
 \\{cap\_bar},\\{cap\_band})$;

\bugonpage E572, new entry at bottom (12/11/88)

\eightpoint\noindent
\\{center\_on}, $\underline{471}$, 477, 483, 515, 521, 537--541.
\bye
Now here are some that I will make soon!