Define \begin as engine-protected (#1492)

latex3 · Oct 13, 2024 · ee9ff90 · ee9ff90
1 parent d0c0924
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diff --git a/base/changes.txt b/base/changes.txt
@@ -6,6 +6,10 @@ to completeness or accuracy and it contains some references to files that are
 not part of the distribution.
 ================================================================================
 
+2024-10-12  Joseph Wright  <[email protected]>
+	* ltmiscen.dtx
+	Define \begin as an engine-protected macro
+
 2024-10-07  Joseph Wright  <[email protected]>
 	* lttemplates.dtx
 	Correct passing of token list content using \KeyValue

diff --git a/base/ltmiscen.dtx b/base/ltmiscen.dtx
@@ -32,7 +32,7 @@
 %<*driver>
 % \fi
 \ProvidesFile{ltmiscen.dtx}
-             [2024/07/10 v1.2e LaTeX Kernel (Misc. Environments)]
+             [2024/10/12 v1.2f LaTeX Kernel (Misc. Environments)]
 % \iffalse
 \documentclass{ltxdoc}
 \GetFileInfo{ltmiscen.dtx}
@@ -748,12 +748,13 @@
 % \changes{v1.1p}{2019/08/27}{Make command robust}
 % \changes{v1.2d}{2024/06/23}{Separate \cs{begin} and \cs{end} definitions
 %     for individual rollback}
+% \changes{v1.2f}{2024/10/12}{Make \cs{begin} engine-protected}
 %    \begin{macrocode}
 %</2ekernel>
 %<*2ekernel|latexrelease>
 %<latexrelease>\IncludeInRelease{2020/10/01}%
 %<latexrelease>                 {\begin}{Use hook system}%
-\DeclareRobustCommand*\begin[1]{%
+\protected\def\begin#1{%
   \UseHook{env/#1/before}%
   \@ifundefined{#1}%
     {\def\reserved@a{\@latex@error{Environment #1 undefined}\@eha}}%

diff --git a/base/testfiles-lthooks/lthooks-rollback-args.tlg b/base/testfiles-lthooks/lthooks-rollback-args.tlg
@@ -526,7 +526,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/github-0354.tlg b/base/testfiles/github-0354.tlg
@@ -2,7 +2,7 @@ This is a generated file for the LaTeX2e validation system.
 Don't change this file in any respect.
 Runaway argument?
 {quote) qqq \end {quote} 
-! Paragraph ended before \begin  was complete.
+! Paragraph ended before \begin was complete.
 <to be read again> 
                    \par 
 l. ...

diff --git a/base/testfiles/github-0479-often.luatex.tlg b/base/testfiles/github-0479-often.luatex.tlg
@@ -536,7 +536,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/github-0479-often.tlg b/base/testfiles/github-0479-often.tlg
@@ -526,7 +526,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/github-0479-often.xetex.tlg b/base/testfiles/github-0479-often.xetex.tlg
@@ -526,7 +526,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/github-0548.luatex.tlg b/base/testfiles/github-0548.luatex.tlg
@@ -1,14 +1,14 @@
 This is a generated file for the LaTeX2e validation system.
 Don't change this file in any respect.
 > \@tempa=macro:
-->\protect \begin  {tabular}{c}a\\b\protect \end  {tabular}.
+->\begin {tabular}{c}a\\b\protect \end  {tabular}.
 l. ......in{tabular}{c}a\\b\end{tabular}}\show\@tempa
 LaTeX Font Info:    External font `cmex10' loaded for size
 (Font)              <7> on input line ....
 LaTeX Font Info:    External font `cmex10' loaded for size
 (Font)              <5> on input line ....
 > \@tempa=macro:
-->\protect \begin  {tabular}{c}a\\b\protect \end  {tabular}.
+->\begin {tabular}{c}a\\b\protect \end  {tabular}.
 l. ......in{tabular}{c}a\\b\end{tabular}}\show\@tempa
 > \@tempa=macro:
 ->\protect \shortstack  {c}{a\\b}.

diff --git a/base/testfiles/github-0548.tlg b/base/testfiles/github-0548.tlg
@@ -1,14 +1,14 @@
 This is a generated file for the LaTeX2e validation system.
 Don't change this file in any respect.
 > \@tempa=macro:
-->\protect \begin  {tabular}{c}a\\b\protect \end  {tabular}.
+->\begin {tabular}{c}a\\b\protect \end  {tabular}.
 l. ......{tabular}{c}a\\b\end{tabular}}\show\@tempa
 LaTeX Font Info:    External font `cmex10' loaded for size
 (Font)              <7> on input line ....
 LaTeX Font Info:    External font `cmex10' loaded for size
 (Font)              <5> on input line ....
 > \@tempa=macro:
-->\protect \begin  {tabular}{c}a\\b\protect \end  {tabular}.
+->\begin {tabular}{c}a\\b\protect \end  {tabular}.
 l. ......{tabular}{c}a\\b\end{tabular}}\show\@tempa
 > \@tempa=macro:
 ->\protect \shortstack  {c}{a\\b}.

diff --git a/base/testfiles/tlb-latexrelease-rollback-2020-10-01.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2020-10-01.luatex.tlg
@@ -536,7 +536,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2020-10-01.tlg b/base/testfiles/tlb-latexrelease-rollback-2020-10-01.tlg
@@ -526,7 +526,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2020-10-01.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2020-10-01.xetex.tlg
@@ -526,7 +526,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2021-06-01.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2021-06-01.luatex.tlg
@@ -537,7 +537,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2021-06-01.tlg b/base/testfiles/tlb-latexrelease-rollback-2021-06-01.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2021-06-01.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2021-06-01.xetex.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2021-11-15.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2021-11-15.luatex.tlg
@@ -537,7 +537,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2021-11-15.tlg b/base/testfiles/tlb-latexrelease-rollback-2021-11-15.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2021-11-15.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2021-11-15.xetex.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2022-06-01.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2022-06-01.luatex.tlg
@@ -537,7 +537,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2022-06-01.tlg b/base/testfiles/tlb-latexrelease-rollback-2022-06-01.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2022-06-01.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2022-06-01.xetex.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2022-11-01.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2022-11-01.luatex.tlg
@@ -537,7 +537,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2022-11-01.tlg b/base/testfiles/tlb-latexrelease-rollback-2022-11-01.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2022-11-01.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2022-11-01.xetex.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2023-06-01.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2023-06-01.luatex.tlg
@@ -537,7 +537,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2023-06-01.tlg b/base/testfiles/tlb-latexrelease-rollback-2023-06-01.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2023-06-01.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2023-06-01.xetex.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2023-11-01.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2023-11-01.luatex.tlg
@@ -537,7 +537,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2023-11-01.tlg b/base/testfiles/tlb-latexrelease-rollback-2023-11-01.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2023-11-01.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2023-11-01.xetex.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2024-06-01.luatex.tlg b/base/testfiles/tlb-latexrelease-rollback-2024-06-01.luatex.tlg
@@ -537,7 +537,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2024-06-01.tlg b/base/testfiles/tlb-latexrelease-rollback-2024-06-01.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-latexrelease-rollback-2024-06-01.xetex.tlg b/base/testfiles/tlb-latexrelease-rollback-2024-06-01.xetex.tlg
@@ -526,7 +526,6 @@ Already applied: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-rollback-005.luatex.tlg b/base/testfiles/tlb-rollback-005.luatex.tlg
@@ -540,7 +540,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-rollback-005.tlg b/base/testfiles/tlb-rollback-005.tlg
@@ -530,7 +530,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/base/testfiles/tlb-rollback-005.xetex.tlg b/base/testfiles/tlb-rollback-005.xetex.tlg
@@ -530,7 +530,6 @@ Applying: [....-..-..] kernel before hook on input line ....
 Applying: [....-..-..] Mask line endings on input line ....
 Already applied: [....-..-..] Mask line endings on input line ....
 Applying: [....-..-..] Use hook system on input line ....
-LaTeX Info: Redefining \begin on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Already applied: [....-..-..] Making \begin /\end robust on input line ....
 Applying: [....-..-..] Making \begin /\end robust on input line ....

diff --git a/required/latex-lab/changes.txt b/required/latex-lab/changes.txt
@@ -1,3 +1,6 @@
+2024-10-12 Joseph Wright <[email protected]>
+	* latex-lab-math.dtx: Sync with protected-begin status
+
 2024-10-11 Ulrike Fischer <[email protected]>
 	* latex-lab-toc.dtx, latex-lab-sec.dtx, latex-lab-toc-kernel-changes: move target
 	handling (\MakeLinkTarget patches) into the kernel.