diff -r 8042869c2072 -r 843dba3d307a src/HOL/Quotient_Examples/Quotient_FSet.thy
--- a/src/HOL/Quotient_Examples/Quotient_FSet.thy	Mon Sep 30 22:57:45 2024 +0200
+++ b/src/HOL/Quotient_Examples/Quotient_FSet.thy	Mon Sep 30 23:32:26 2024 +0200
@@ -289,7 +289,7 @@
   is "Cons" by auto
 
 syntax
-  "_fset" :: "args => 'a fset"  (\<open>{|(\<open>notation=\<open>mixfix finite set enumeration\<close>\<close>_)|}\<close>)
+  "_fset" :: "args => 'a fset"  (\<open>(\<open>indent=2 notation=\<open>mixfix finite set enumeration\<close>\<close>{|_|})\<close>)
 syntax_consts
   insert_fset
 translations