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-rw-r--r--macros/latex/contrib/l3kernel/l3sys.dtx7
1 files changed, 5 insertions, 2 deletions
diff --git a/macros/latex/contrib/l3kernel/l3sys.dtx b/macros/latex/contrib/l3kernel/l3sys.dtx
index af09373f25..24e79512c7 100644
--- a/macros/latex/contrib/l3kernel/l3sys.dtx
+++ b/macros/latex/contrib/l3kernel/l3sys.dtx
@@ -43,7 +43,7 @@
% }^^A
% }
%
-% \date{Released 2019-10-28}
+% \date{Released 2019-11-07}
%
% \maketitle
%
@@ -395,7 +395,10 @@
{
\sys_finalise:
\str_if_exist:NTF \c_sys_backend_str
- { \__kernel_msg_error:nn { sys } { backend-set } }
+ {
+ \str_if_eq:VnF \c_sys_backend_str {#1}
+ { \__kernel_msg_error:nn { sys } { backend-set } }
+ }
{
\tl_if_blank:nF {#1}
{ \tl_set:Nn \g_@@_backend_tl {#1} }