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src/HOL/Corec_Examples/Stream_Processor.thy
changeset 80914 d97fdabd9e2b
parent 72184 881bd98bddee 
--- a/src/HOL/Corec_Examples/Stream_Processor.thy	Fri Sep 20 19:07:10 2024 +0200
+++ b/src/HOL/Corec_Examples/Stream_Processor.thy	Fri Sep 20 19:51:08 2024 +0200
@@ -61,7 +61,7 @@
 lemma copy_sel[simp]: "out copy = Get (\<lambda>a. Put a copy)"
   by (subst copy.code; simp)
 
-corecursive sp_comp (infixl "oo" 65) where
+corecursive sp_comp (infixl \<open>oo\<close> 65) where
   "sp oo sp' = (case (out sp, out sp') of
       (Put b sp, _) \<Rightarrow> In (Put b (sp oo sp'))
     | (Get f, Put b sp) \<Rightarrow> In (f b) oo sp
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