src/HOL/Tools/BNF/bnf_lfp.ML

 
         fun wit_tac ctxt = unfold_thms_tac ctxt (flat Iwit_defss) THEN
           mk_wit_tac ctxt n (flat ctor_Iset_thmss) (maps wit_thms_of_bnf bnfs);
 
         val (Ibnfs, lthy) =
-          fold_map6 (fn b => fn tacs => fn map_b => fn rel_b => fn set_bs => fn consts => fn lthy =>
+          fold_map6 (fn b => fn tacs => fn map_b => fn rel_b => fn set_bs => fn consts =>
             bnf_def Do_Inline (user_policy Note_Some) false I tacs wit_tac (SOME deads)
-              map_b rel_b set_bs consts lthy
-            |> (fn (bnf, lthy) => (bnf, register_bnf (Local_Theory.full_name lthy b) bnf lthy)))
+              map_b rel_b set_bs consts
+            #> (fn (bnf, lthy) => (bnf, register_bnf (Local_Theory.full_name lthy b) bnf lthy)))
           bs tacss map_bs rel_bs set_bss
             ((((((bs ~~ Ts) ~~ Imaps) ~~ Isetss_by_bnf) ~~ Ibds) ~~ Iwitss) ~~ map SOME Irels)
             lthy;
 
         val timer = time (timer "registered new datatypes as BNFs");