src/HOL/Tools/old_primrec.ML
changeset 33037 b22e44496dc2
parent 32863 5e8cef567042
child 33038 8f9594c31de4
--- a/src/HOL/Tools/old_primrec.ML	Tue Oct 20 13:37:56 2009 +0200
+++ b/src/HOL/Tools/old_primrec.ML	Tue Oct 20 16:13:01 2009 +0200
@@ -226,7 +226,7 @@
       (case Symtab.lookup dt_info tname of
           NONE => primrec_err (quote tname ^ " is not a datatype")
         | SOME dt =>
-            if tnames' subset (map (#1 o snd) (#descr dt)) then
+            if gen_subset (op =) (tnames', map (#1 o snd) (#descr dt)) then
               (tname, dt)::(find_dts dt_info tnames' tnames)
             else find_dts dt_info tnames' tnames);