Fix a crash by "\ruby{Weierstraß}{ワイエルシュトラス}"

[luatex-ja/luatexja.git] / src / patches / lltjp-listings.sty

diff --git a/src/patches/lltjp-listings.sty b/src/patches/lltjp-listings.sty
index e54cb00..3f7c220 100644 (file)
--- a/src/patches/lltjp-listings.sty
+++ b/src/patches/lltjp-listings.sty
@@ -367,11 +367,13 @@
          #3\catcode\ltjlineendcomment=9\lst@escapebegin\expandafter\lst@next%"
          \fi}%
         {}}
+\def\ltj@lst@emptygrp{{}}
 \def\ltj@lst@escape@setup#1{%
   \begingroup\lccode`\~=`#1\lowercase{%
   \gdef\lst@next##1~{%
      \let\lst@arg\@empty\ltj@lst@remove@jacmd{##1}%
-     \expandafter\expandafter\expandafter\scantokens\expandafter{\lst@arg\relax}%
+     \expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter
+          \scantokens\expandafter\expandafter\expandafter{\expandafter\ltj@lst@emptygrp\lst@arg\empty}%
      ~}%
   }\endgroup
 }