diff -r 6c9453ec2191 -r 74f1b0f10b2b src/HOL/Hoare_Parallel/OG_Examples.thy
--- a/src/HOL/Hoare_Parallel/OG_Examples.thy	Sun Oct 21 08:19:06 2018 +0200
+++ b/src/HOL/Hoare_Parallel/OG_Examples.thy	Sun Oct 21 09:39:09 2018 +0200
@@ -534,9 +534,9 @@
  COEND
  \<lbrace>\<acute>x=n\<rbrace>"
 apply oghoare
-apply (simp_all cong del: sum.strong_cong)
+apply (simp_all cong del: sum.cong_strong)
 apply (tactic \<open>ALLGOALS (clarify_tac @{context})\<close>)
-apply (simp_all cong del: sum.strong_cong)
+apply (simp_all cong del: sum.cong_strong)
    apply(erule (1) Example2_lemma2)
   apply(erule (1) Example2_lemma2)
  apply(erule (1) Example2_lemma2)