diff -r 46f59511b7bb -r d97fdabd9e2b src/HOL/Library/Cardinality.thy
--- a/src/HOL/Library/Cardinality.thy	Fri Sep 20 19:07:10 2024 +0200
+++ b/src/HOL/Library/Cardinality.thy	Fri Sep 20 19:51:08 2024 +0200
@@ -30,7 +30,7 @@
 
 subsection \<open>Cardinalities of types\<close>
 
-syntax "_type_card" :: "type => nat" ("(1CARD/(1'(_')))")
+syntax "_type_card" :: "type => nat" (\<open>(1CARD/(1'(_')))\<close>)
 
 syntax_consts "_type_card" == card