--- /usr/local/texlive/2019dev/texmf-dist/tex/generic/babel-italian/italian.ldf	2019-01-06 07:38:02.000000000 +0900
+++ Downloads/italian.ldf	2019-11-16 01:19:38.000000000 +0900
@@ -59,10 +59,10 @@
   \finalhyphendemerits50000000}%
 
 \addto\extrasitalian{%
-\lccode\string`'=`' \unless\ifcsname pdfmatch\endcsname
+\lccode\string`'=`' \ifcsname Umathcode\endcsname
 \lccode\string"2019=\string"2019\fi}
 \addto\noextrasitalian{%
-\lccode\string`'=0 \unless\ifcsname pdfmatch\endcsname
+\lccode\string`'=0 \ifcsname Umathcode\endcsname
 \lccode\string"2019=0\fi}
 
 \newcount\it@lettering \it@lettering=\@ne