+
+let _verbose = ref false
+let set_verbose b = _verbose := b
+let verbose ppf fmt =
+ if !_verbose then begin
+ pp_open_hovbox ppf 0;
+ kfprintf (fun _ ->
+ pp_close_box ppf ();
+ fprintf ppf "@?")
+ ppf fmt
+ end else
+ ikfprintf (fun _ ->
+ pp_close_box ppf ();
+ fprintf ppf "@?")
+ ppf fmt