Fix equivalent of \end in \text_purify:n

latex3 · Oct 20, 2020 · 54f8761 · 54f8761
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diff --git a/l3kernel/CHANGELOG.md b/l3kernel/CHANGELOG.md
@@ -9,6 +9,7 @@ this project uses date-based 'snapshot' version identifiers.
 
 ### Fixed
 - Avoid relying on braced `\input` primitive syntax
+- Correct expansion of environments in `\text_purify:n`
 
 ### Changed
 - Extend case changer to cover all of Greek with pdfTeX

diff --git a/l3kernel/l3text-purify.dtx b/l3kernel/l3text-purify.dtx
@@ -398,10 +398,15 @@
   { \text_declare_purify_equivalent:Nn #1 { } }
 %    \end{macrocode}
 % Environments have to be handled by pure expansion.
+%
+% \begin{macro}{\@@_end_env:n}
 %    \begin{macrocode}
 \text_declare_purify_equivalent:Nn \begin { \use:c }
-\text_declare_purify_equivalent:Nn \end { \use:c }
+\text_declare_purify_equivalent:Nn \end { \@@_end_env:n }
+\cs_new:Npn \@@_end_env:n #1 { \cs:w end #1 \cs_end: }
 %    \end{macrocode}
+% \end{macro}
+%
 % Some common symbols and similar ideas.
 %    \begin{macrocode}
 \text_declare_purify_equivalent:Nn \\ { }