diff -r 713424d012fd -r 70076ba563d2 src/HOL/HOLCF/ConvexPD.thy
--- a/src/HOL/HOLCF/ConvexPD.thy	Wed Aug 28 20:46:45 2024 +0200
+++ b/src/HOL/HOLCF/ConvexPD.thy	Wed Aug 28 22:54:45 2024 +0200
@@ -178,12 +178,13 @@
     (infixl "\<union>\<natural>" 65) where
   "xs \<union>\<natural> ys == convex_plus\<cdot>xs\<cdot>ys"
 
+nonterminal convex_pd_args
 syntax
-  "_convex_pd" :: "args \<Rightarrow> logic" ("{_}\<natural>")
-
+  "" :: "logic \<Rightarrow> convex_pd_args"  ("_")
+  "_convex_pd_args" :: "logic \<Rightarrow> convex_pd_args \<Rightarrow> convex_pd_args"  ("_,/ _")
+  "_convex_pd" :: "convex_pd_args \<Rightarrow> logic"  ("{_}\<natural>")
 syntax_consts
-  "_convex_pd" == convex_add
-
+  "_convex_pd_args" "_convex_pd" == convex_add
 translations
   "{x,xs}\<natural>" == "{x}\<natural> \<union>\<natural> {xs}\<natural>"
   "{x}\<natural>" == "CONST convex_unit\<cdot>x"