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src/HOL/Proofs/ex/Proof_Terms.thy
changeset 67405 e9ab4ad7bd15
parent 67399 eab6ce8368fa
child 69597 ff784d5a5bfb 
--- a/src/HOL/Proofs/ex/Proof_Terms.thy	Thu Jan 11 12:32:07 2018 +0100
+++ b/src/HOL/Proofs/ex/Proof_Terms.thy	Thu Jan 11 13:48:17 2018 +0100
@@ -35,7 +35,7 @@
   (*all theorems used in the graph of nested proofs*)
   val all_thms =
     Proofterm.fold_body_thms
-      (fn {name, ...} => insert (=) name) [body] [];
+      (fn {name, ...} => insert (op =) name) [body] [];
 \<close>
 
 text \<open>
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