diff --git a/src/batIO.ml b/src/batIO.ml
index 10c1a3e75..7cff86983 100644
--- a/src/batIO.ml
+++ b/src/batIO.ml
@@ -723,3 +723,102 @@ let string_of_t_printer p x =
 
 let to_format printer =
   fun fmt t -> Format.pp_print_string fmt (to_string printer t)
+
+module Incubator = struct
+  module Array = struct
+    let pp ?(flush = false) ?(first = "[|") ?(last = "|]") ?(sep = "; ") ?(indent = String.length first) pp f a =
+      let open Format in
+      pp_open_box f indent;
+      pp_print_cut f ();
+      pp_print_string f first;
+      pp_print_cut f ();
+
+      for i = 0 to Array.length a - 2 do
+        pp_open_box f indent;
+        pp f a.(i);
+        pp_print_string f sep;
+        pp_close_box f ();
+        pp_print_cut f ();
+      done;
+
+      if Array.length a > 0 then (
+        (* Print the last element without a trailing separator *)
+        pp_open_box f indent;
+        pp f a.(Array.length a - 1);
+        pp_close_box f ();
+      );
+
+      pp_print_cut f ();
+      pp_print_string f last;
+      pp_close_box f ();
+      if flush then pp_print_flush f ()
+  end
+
+  module Enum = struct
+    let pp ?(flush = false) ?(first = "") ?(last = "") ?(sep = " ") ?(indent = String.length first) pp f e =
+      let open Format in
+      pp_open_box f indent;
+      pp_print_cut f ();
+      pp_print_string f first;
+      pp_print_cut f ();
+      match BatEnum.get e with
+      | None ->
+          pp_print_string f last;
+          pp_close_box f ();
+          if flush then pp_print_flush f ()
+      | Some x ->
+          pp_open_box f indent;
+          pp f x;
+          let rec aux () =
+            match BatEnum.get e with
+            | None ->
+                pp_close_box f ();
+                pp_print_cut f ();
+                pp_print_string f last;
+                pp_close_box f ();
+                if flush then pp_print_flush f ()
+            | Some x ->
+                pp_print_string f sep;
+                pp_close_box f ();
+                pp_print_cut f ();
+                pp_open_box f indent;
+                pp f x;
+                aux ()
+          in
+          aux ()
+  end
+
+  module List = struct
+    let pp ?(flush = false) ?(first = "[") ?(last = "]") ?(sep = "; ") ?(indent = String.length first) pp f l =
+      let open Format in
+      pp_open_box f indent;
+      pp_print_cut f ();
+      pp_print_string f first;
+      pp_print_cut f ();
+      match l with
+      | [] ->
+          pp_print_string f last;
+          pp_close_box f ();
+          if flush then pp_print_flush f ()
+      | hd :: tl ->
+          pp_open_box f indent;
+          pp f hd;
+          let rec aux rem =
+            match rem with
+            | [] ->
+                pp_close_box f ();
+                pp_print_cut f ();
+                pp_print_string f last;
+                pp_close_box f ();
+                if flush then pp_print_flush f ()
+            | hd :: tl ->
+                pp_print_string f sep;
+                pp_close_box f ();
+                pp_print_cut f ();
+                pp_open_box f indent;
+                pp f hd;
+                aux tl
+          in
+          aux tl
+  end
+end
diff --git a/src/batIO.mli b/src/batIO.mli
index ae00a87a3..282d68ae4 100644
--- a/src/batIO.mli
+++ b/src/batIO.mli
@@ -929,3 +929,70 @@ val make_enum : (input -> 'a) -> input -> 'a BatEnum.t
 
 val get_output_id : _ output -> int
 val get_input_id  : input -> int
+
+module Incubator : sig
+  (** {6 Format-based pretty-printing} *)
+
+  module Array : sig
+    val pp :
+      ?flush:bool ->
+      ?first:string ->
+      ?last:string ->
+      ?sep:string ->
+      ?indent:int ->
+      (Format.formatter -> 'a -> 'b) -> Format.formatter -> 'a array -> unit
+    (** Print the contents of an array, with [first] preceeding the first item 
+        (default: ["\[|"]), [last] following the last item (default: ["|\]"])
+        and [sep] separating items (default: ["; "]). A printing function must
+        be provided to print the items in the array. The [flush] parameter
+        (default: [false]) should be set to [true] for the outer-most printing
+        call.  Setting inner calls to [true] - for example, for nested values -
+        prevent indentation from working properly.
+        
+        Example:
+          [pp ~flush:true Format.pp_print_int Format.std_formatter \[|1; 2; 3|\]]
+    *)
+  end
+
+  module Enum : sig
+    val pp :
+      ?flush:bool ->
+      ?first:string ->
+      ?last:string ->
+      ?sep:string ->
+      ?indent:int ->
+      (Format.formatter -> 'a -> 'b) -> Format.formatter -> 'a BatEnum.t -> unit
+    (** Print the contents of an enum, with [first] preceeding the first item 
+        (default: [""]), [last] following the last item (default: [""])
+        and [sep] separating items (default: [" "]). A printing function must
+        be provided to print the items in the enum. The [flush] parameter
+        (default: [false]) should be set to [true] for the outer-most printing
+        call.  Setting inner calls to [true] - for example, for nested values -
+        prevent indentation from working properly.
+        
+        Example:
+          [pp ~flush:true Format.pp_print_int Format.std_formatter (1 -- 3)] *)
+  end
+
+  module List : sig
+    val pp :
+      ?flush:bool ->
+      ?first:string ->
+      ?last:string ->
+      ?sep:string ->
+      ?indent:int ->
+      (Format.formatter -> 'a -> 'b) -> Format.formatter -> 'a list -> unit
+    (** Print the contents of a list, with [first] preceeding the first item 
+        (default: ["\["]), [last] following the last item (default: ["\]"])
+        and [sep] separating items (default: ["; "]). A printing function must
+        be provided to print the items in the list. The [flush] parameter
+        (default: [false]) should be set to [true] for the outer-most printing
+        call.  Setting inner calls to [true] - for example, for nested values -
+        prevent indentation from working properly.
+        
+        Example:
+          [pp ~flush:true Format.pp_print_int Format.std_formatter \[1; 2; 3\]]
+    *)
+  end
+end
+