1 files changed, 55 insertions, 13 deletions
diff --git a/Master/texmf-dist/tex/latex/mathfam256/mathfam256.sty b/Master/texmf-dist/tex/latex/mathfam256/mathfam256.sty
index 6b0fb9dc7e2..3b482bf6f72 100644
--- a/Master/texmf-dist/tex/latex/mathfam256/mathfam256.sty
+++ b/Master/texmf-dist/tex/latex/mathfam256/mathfam256.sty
@@ -1,9 +1,9 @@
 %
 % mathfam256.sty
-% 2019/09/14 v0.3  Hironobu Yamashita (aminophen)
-%   -- bug fix and support LaTeX2e 2019-10-01
-% 2018/01/22 v0.2  Hironobu Yamashita (aminophen)
-%   -- first CTAN version
+% 2020/01/23 v0.5  -- compatibility with amstext
+% 2020/01/22 v0.4  -- sync with LaTeX2e 2020-02-02 dev
+% 2019/09/14 v0.3  -- bug fix and support LaTeX2e 2019-10-01
+% 2018/01/22 v0.2  -- first CTAN version
 % 2016/12/26 v0.1  Hironobu Yamashita (aminophen)
 % 2009/02/20 v0.01 Kazuyoshi Yamamoto (ymt)
 %
@@ -16,7 +16,7 @@
 
 \NeedsTeXFormat{LaTeX2e}
 \ProvidesPackage{mathfam256}
-  [2019/09/14 v0.3 Extend math family up to 256]
+  [2020/01/23 v0.5 Extend math family up to 256]
 
 %% engine check
 \ifx\omathchar\@undefined
@@ -100,6 +100,11 @@
 
 %% LaTeX2e 2019/10/01 makes lots of commands robust;
 %% follow both old and new behavior
+%% -- Among the changes in 2019/10/01,
+%%    "making math delimiters robust with \MakeRobust"
+%%    was backed out and replaced with "engine protection"
+%%    in 2020/02/02.
+%%    (see https://github.com/latex3/latex2e/issues/251)
 \edef\omfcclvi@reset{%
   \catcode`\noexpand\&=\the\catcode`\&\relax
   \catcode`\noexpand\~=\the\catcode`\~\relax
@@ -140,12 +145,13 @@
     \ifnum#1<\sixt@@n\relax\else\@tempswafalse\fi
     \ifnum#2<\sixt@@n\relax\else\@tempswafalse\fi
   \if@tempswa
+&   \protected
     \xdef#3{\delimiter"\mathchar@type#4\hexnumber@#1#5\hexnumber@#2#6\relax}%
   \else
+&   \protected
     \xdef#3{\odelimiter"\mathchar@type#4\hexnumber@@#100#5%
                        "\hexnumber@@#200#6\relax}%
   \fi
-& \MakeRobust#3%
 }
 \def\set@@mathdelimiter#1#2#3#4#5{%
   \@tempswatrue
@@ -269,9 +275,7 @@
     E0\or E1\or E2\or E3\or E4\or E5\or E6\or E7\or E8\or
           E9\or EA\or EB\or EC\or ED\or EE\or EF\or
     F0\or F1\or F2\or F3\or F4\or F5\or F6\or F7\or F8\or
-          F9\or FA\or FB\or FC\or FD\or FE\or FF
-  \fi
-}
+          F9\or FA\or FB\or FC\or FD\or FE\or FF\fi}
 
 %% patch LaTeX2e internal only if newer than (or equal to) 2015/01/01
 %% since the error code was introduced at that time
@@ -435,15 +439,24 @@
     \ifin@
       \begingroup
         \edef\reserved@a{\noexpand\in@
+            {\expandafter\@gobble\string\delimiter}{\meaning#1}}%
+        \reserved@a
+        \ifin@
+          \oset@mathdelimiter{#1}{#2}{#3}{#4}{#5}{#6}%
+          \@font@info{Redeclaring math delimiter \string#1}%
+        \else
+      %%%%% BEGIN -- only for "real" format as of 2019-10-01 which used \MakeRobust
+        \edef\reserved@a{\noexpand\in@
           {\expandafter\@gobble\string\delimiter}%
-~         {\meaning#1}}%
-&         {\expandafter\meaning\csname\expandafter\@gobble\string#1\space\endcsname}}%
+          {\expandafter\meaning\csname\expandafter\@gobble\string#1\space\endcsname}}%
         \reserved@a
         \ifin@
-&         \expandafter\let\csname\expandafter\@gobble\string#1\space\endcsname\@undefined
+          \global % to cancel global assignment done by \MakeRobust
+          \expandafter\let\csname\expandafter\@gobble\string#1\space\endcsname\@undefined
           \oset@mathdelimiter{#1}{#2}{#3}{#4}{#5}{#6}%
           \@font@info{Redeclaring math delimiter \string#1}%
         \else
+      %%%%% END
           \expandafter\ifx
             \csname\expandafter\@gobble\string#1\endcsname
             \relax
@@ -451,6 +464,9 @@
           \else
             \@latex@error{Command `\string#1' already defined}\@eha
           \fi
+      %%%%% BEGIN -- only for "real" format as of 2019-10-01 which used \MakeRobust
+        \fi
+      %%%%% END
         \fi
       \endgroup
     \else
@@ -483,9 +499,9 @@
     \numexpr"1000000*\mathchar@type#2+"10000*\csname sym#3\endcsname+#4%
   \count\tw@
     \numexpr"10000*\csname sym#5\endcsname+#6%
+& \protected
   \xdef#1{\odelimiter\number\count\z@\space \number\count\tw@}%
   \endgroup
-& \MakeRobust#1%
 }
 \@onlypreamble\oset@mathdelimiter
 \def\oset@@mathdelimiter#1#2#3#4#5{%
@@ -536,5 +552,31 @@
 %% reset
 \omfcclvi@reset
 
+%% patch: amstext.sty redefines \mathhexbox to use its own \text
+\let\omfcclvi@my@mathhexbox\mathhexbox
+\def\omfcclvi@patch@mathhexbox{%
+  \ifx\mathhexbox\omfcclvi@old@mathhexbox
+    \expandafter\@firstoftwo   % known -> info only
+  \else\ifx\mathhexbox\omfcclvi@my@mathhexbox
+    \expandafter\expandafter\expandafter\@firstoftwo   % known -> info only
+  \else
+    \expandafter\expandafter\expandafter\@secondoftwo  % unknown -> warning
+  \fi\fi
+  \PackageInfo\PackageWarning{mathfam256}{Redefining \string\mathhexbox}%
+  \let\mathhexbox\omfcclvi@new@mathhexbox
+  \let\omfcclvi@old@mathhexbox\@undefined
+  \let\omfcclvi@new@mathhexbox\@undefined
+  \let\omfcclvi@patch@mathhexbox\@undefined}
+\begingroup \catcode`\"=12
+\gdef\omfcclvi@old@mathhexbox#1#2#3{\text{$\m@th\mathchar"#1#2#3$}}
+\gdef\omfcclvi@new@mathhexbox#1#2#3{%
+  \ifnum"#1<\sixt@@n
+    \text{$\m@th \mathchar"#1#2#3$}%
+  \else
+    \text{$\m@th \omathchar"#100#2#3$}%
+  \fi}
+\endgroup
+\AtBeginDocument{\ifx\text\@undefined\else \omfcclvi@patch@mathhexbox \fi}
+
 %% all done
 \endinput