diff -r 18500bd1f47b -r 655f583840d0 src/HOL/HOLCF/ConvexPD.thy
--- a/src/HOL/HOLCF/ConvexPD.thy	Sat Jan 08 10:02:43 2011 -0800
+++ b/src/HOL/HOLCF/ConvexPD.thy	Sat Jan 08 11:18:09 2011 -0800
@@ -181,7 +181,7 @@
   "xs \<union>\<natural> ys == convex_plus\<cdot>xs\<cdot>ys"
 
 syntax
-  "_convex_pd" :: "args \<Rightarrow> 'a convex_pd" ("{_}\<natural>")
+  "_convex_pd" :: "args \<Rightarrow> logic" ("{_}\<natural>")
 
 translations
   "{x,xs}\<natural>" == "{x}\<natural> \<union>\<natural> {xs}\<natural>"