Re: [Caml-list] Format questions

[Josh Berdine <josh@berdine.net>]

On Sat, Apr 08 2017, Matej Kosik wrote:

> Hi everybody,
>
> I am trying to understand the concepts in the Format module.
>
> While reading this:
>
>   https://ocaml.org/learn/tutorials/format.html
>
> One of the mini experiments I did was:
>
>   set_margin 11;
>   open_hvbox 0;
>   print_string "---";
>   print_space ();
>   print_string "---";
>   print_space ();
>   print_string "---";
>   print_newline ();
>   print_newline ();
>
> I've got the expected output, which is:
>
>   ---
>   ---
>   ---
>
> No surprises.
>
> However, when I tried to write express the same intentions via Format.fprintf function:
>
>   Format.set_margin 11;
>   Format.fprintf std_formatter "@[<hv 0>---@ ---@ ---@.@.";
>
> I get:
>
>   --- --- ---
>
> I'd like to ask for some clues as to why the output of the above Format.fprintf is different from the more verbose version above.

Are you, by chance, evaluating this in utop (which seems to mess with std_formatter)?   I see your expected behavior using the standard toplevel.  (After adding Format. to std_formatter)