On Jan 12, 2006, at 10:55, Jean-Christophe Filliatre wrote:

>   val print_list :
>     ?sep:(formatter -> unit -> unit) ->
>     (formatter -> 'a -> unit) -> formatter -> 'a list -> unit
>
> which comes with a handy list of predefined separators:
>
>   val space : formatter -> unit -> unit
>   val newline : formatter -> unit -> unit
>   val comma : formatter -> unit -> unit
>   val semi : formatter -> unit -> unit
>   val nothing : formatter -> unit -> unit

Yuck.  Isn't this type (formatter -> unit -> unit) isomorphic to string,
in the absence of side-effects?  Or do you really need separators that
behave differently depending on the state of some reference?

-- Damien