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src/HOL/Groups.thy
changeset 69605 a96320074298
parent 69593 3dda49e08b9d
child 70347 e5cd5471c18a 
--- a/src/HOL/Groups.thy	Sun Jan 06 13:44:33 2019 +0100
+++ b/src/HOL/Groups.thy	Sun Jan 06 15:04:34 2019 +0100
@@ -988,7 +988,7 @@
 
 end
 
-ML_file "Tools/group_cancel.ML"
+ML_file \<open>Tools/group_cancel.ML\<close>
 
 simproc_setup group_cancel_add ("a + b::'a::ab_group_add") =
   \<open>fn phi => fn ss => try Group_Cancel.cancel_add_conv\<close>
isabelle