src/HOL/Tools/BNF/bnf_util.ML

   val fold_map9: ('a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g -> 'h -> 'i -> 'j -> 'k * 'j) ->
     'a list -> 'b list -> 'c list -> 'd list -> 'e list -> 'f list -> 'g list -> 'h list ->
     'i list -> 'j -> 'k list * 'j
   val split_list4: ('a * 'b * 'c * 'd) list -> 'a list * 'b list * 'c list * 'd list
   val split_list5: ('a * 'b * 'c * 'd * 'e) list -> 'a list * 'b list * 'c list * 'd list * 'e list
+  val split_list6: ('a * 'b * 'c * 'd * 'e * 'f) list -> 'a list * 'b list * 'c list * 'd list *
+    'e list * 'f list
 
   val mk_TFreess: int list -> Proof.context -> typ list list * Proof.context
   val mk_Freesss: string -> typ list list list -> Proof.context ->
     term list list list * Proof.context
   val mk_Freessss: string -> typ list list list list -> Proof.context ->

 fun split_list5 [] = ([], [], [], [], [])
   | split_list5 ((x1, x2, x3, x4, x5) :: xs) =
     let val (xs1, xs2, xs3, xs4, xs5) = split_list5 xs;
     in (x1 :: xs1, x2 :: xs2, x3 :: xs3, x4 :: xs4, x5 :: xs5) end;
 
+fun split_list6 [] = ([], [], [], [], [], [])
+  | split_list6 ((x1, x2, x3, x4, x5, x6) :: xs) =
+    let val (xs1, xs2, xs3, xs4, xs5, xs6) = split_list6 xs;
+    in (x1 :: xs1, x2 :: xs2, x3 :: xs3, x4 :: xs4, x5 :: xs5, x6 :: xs6) end;
+
 val parse_type_arg_constrained =
   Parse.type_ident -- Scan.option (@{keyword "::"} |-- Parse.!!! Parse.sort);
 
 val parse_type_arg_named_constrained =
    (Parse.reserved "dead" >> K NONE || parse_opt_binding_colon >> SOME) --