\RequirePackage{fontspec,luatexja}
\ExplSyntaxOn
-\cs_set:Nn \fontspec_visible_space:
- {
- \font_glyph_if_exist:NnTF \font {"2423}
- { \ltjalchar"2423\scan_stop: }
- { \fontspec_visible_space_fallback: }
- }
+\@ifpackagelater{fontspec}{2017/01/01}{
+ \cs_set:Nn \fontspec_visible_space:
+ {
+ \__fontspec_primitive_font_glyph_if_exist:NnTF \font {"2423}
+ { \ltjalchar"2423\scan_stop: }
+ { \fontspec_visible_space_fallback: }
+ }
+}{
+ \cs_set:Nn \fontspec_visible_space:
+ {
+ \font_glyph_if_exist:NnTF \font {"2423}
+ { \ltjalchar"2423\scan_stop: }
+ { \fontspec_visible_space_fallback: }
+ }
+}
\def\verb
{
\relax\ifmmode\hbox\else\leavevmode\fi % same as lltjcore