diff -r 6a33337eb08d -r 94bace5078ba src/Pure/Isar/specification.ML
--- a/src/Pure/Isar/specification.ML	Sun Oct 20 22:40:18 2024 +0200
+++ b/src/Pure/Isar/specification.ML	Mon Oct 21 11:55:51 2024 +0200
@@ -94,7 +94,7 @@
     fun get Cs (Const ("_type_constraint_", C) $ t) = get (C :: Cs) t
       | get Cs (Free (y, T)) =
           if x = y then
-            map_filter Term_Position.decode_positionT
+            maps Term_Position.decode_positionT
               (T :: map (Type.constraint_type ctxt) Cs)
           else []
       | get _ (t $ u) = get [] t @ get [] u