Merge pull request #43 from jkuczm/support_older_distros

Use `\hbox_unpack_(drop|clear):N` whichever is available
jkuczm · May 13, 2021 · c36af52 · c36af52
2 parents d63fe41 + 7ff1d2d
commit c36af52
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/mmacells.sty b/mmacells.sty
@@ -642,10 +642,18 @@
     \hbox_set:Nn \@labels
       {
         \skip_horizontal:N \@totalleftmargin
-        \hbox_unpack_drop:N \@labels
+        \__mmacells_hbox_unpack_drop:N \@labels
       }
   }
 
+% \hbox_unpack_clear:N was renamed to \hbox_unpack_drop:N in 2019,
+% but some distributions still ship older versions of expl3.
+\if_cs_exist:N \hbox_unpack_drop:N
+  \cs_new_protected:Npn \__mmacells_hbox_unpack_drop:N { \hbox_unpack_drop:N }
+\else:
+  \cs_new_protected:Npn \__mmacells_hbox_unpack_drop:N { \hbox_unpack_clear:N }
+\fi:
+
 \cs_new_protected:Npn \__mmacells_group_insert_after:n #1
   {
     \cs_gset_protected_nopar:Npn \g__mmacells_tmp_cs { #1 }