[Caml-list] Format questions

[Matej Kosik <5764c029b688c1c0d24a2e97cd764f@gmail.com>]

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.

(this is the one module that, to this day, seems a bit mysterious to me --- that is why I ask)

Thanks in advance for the help.