diff -r 843dba3d307a -r c007e6d9941d src/HOL/Quotient_Examples/Lift_FSet.thy
--- a/src/HOL/Quotient_Examples/Lift_FSet.thy	Mon Sep 30 23:32:26 2024 +0200
+++ b/src/HOL/Quotient_Examples/Lift_FSet.thy	Tue Oct 01 20:39:16 2024 +0200
@@ -97,8 +97,6 @@
 
 syntax
   "_fset" :: "args => 'a fset"  (\<open>(\<open>indent=2 notation=\<open>mixfix finite set enumeration\<close>\<close>{|_|})\<close>)
-syntax_consts
-  fcons
 translations
   "{|x, xs|}" == "CONST fcons x {|xs|}"
   "{|x|}"     == "CONST fcons x {||}"