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src/HOL/Library/datatype_records.ML
changeset 74561 8e6c973003c8
parent 72450 24bd1316eaae 
--- a/src/HOL/Library/datatype_records.ML	Wed Oct 20 17:11:46 2021 +0200
+++ b/src/HOL/Library/datatype_records.ML	Wed Oct 20 18:13:17 2021 +0200
@@ -32,7 +32,6 @@
   type T = data
   val empty = Symtab.empty
   val merge = Symtab.merge op =
-  val extend = I
 )
 
 fun mk_eq_dummy (lhs, rhs) =
isabelle