--- a/src/HOL/Tools/typedef.ML Wed Oct 20 17:11:46 2021 +0200
+++ b/src/HOL/Tools/typedef.ML Wed Oct 20 18:13:17 2021 +0200
@@ -66,7 +66,6 @@
(
type T = info list Symtab.table;
val empty = Symtab.empty;
- val extend = I;
fun merge data = Symtab.merge_list (K true) data;
);