1 files changed, 10 insertions, 8 deletions
diff --git a/Master/texmf-dist/source/latex/l3backend/l3backend-basics.dtx b/Master/texmf-dist/source/latex/l3backend/l3backend-basics.dtx
index 978044c5ea1..ac6952ee3e4 100644
--- a/Master/texmf-dist/source/latex/l3backend/l3backend-basics.dtx
+++ b/Master/texmf-dist/source/latex/l3backend/l3backend-basics.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-21}
+% \date{Released 2020-02-23}
 %
 % \maketitle
 %
@@ -71,23 +71,23 @@
 %<*package>
 \ProvidesExplFile
 %<*dvipdfmx>
-  {l3backend-dvipdfmx.def}{2020-02-21}{}
+  {l3backend-dvipdfmx.def}{2020-02-23}{}
   {L3 backend support: dvipdfmx}
 %</dvipdfmx>
 %<*dvips>
-  {l3backend-dvips.def}{2020-02-21}{}
+  {l3backend-dvips.def}{2020-02-23}{}
   {L3 backend support: dvips}
 %</dvips>
 %<*dvisvgm>
-  {l3backend-dvisvgm.def}{2020-02-21}{}
+  {l3backend-dvisvgm.def}{2020-02-23}{}
   {L3 backend support: dvisvgm}
 %</dvisvgm>
 %<*pdfmode>
-  {l3backend-pdfmode.def}{2020-02-21}{}
+  {l3backend-pdfmode.def}{2020-02-23}{}
   {L3 backend support: PDF mode}
 %</pdfmode>
 %<*xdvipdfmx>
-  {l3backend-xdvipdfmx.def}{2020-02-21}{}
+  {l3backend-xdvipdfmx.def}{2020-02-23}{}
   {L3 backend support: xdvipdfmx}
 %</xdvipdfmx>
 %</package>
@@ -156,10 +156,12 @@
 % actual output does not write anything.
 %    \begin{macrocode}
 \cs_if_exist:NTF \AtBeginDvi
-  { \exp_not:N \AtBeginDvi }
+  { \AtBeginDvi }
   { \use:n }
     {
-      \bool_if:NT \g__kernel_backend_header_bool
+      \bool_lazy_and:nnT
+        { \cs_if_exist_p:N \g__kernel_backend_header_bool }
+        { \g__kernel_backend_header_bool }
         { \__kernel_backend_literal:n { header = l3backend-dvips.pro } }
     }
 %    \end{macrocode}