[core] [api] Support OCaml 4.08

The changes are large due to `Pervasives` deprecation:

- the `Pervasives` module has been deprecated in favor of `Stdlib`, we
  have opted for introducing a few wrapping functions in `Util` and
  just unqualified the rest of occurrences. We avoid the shims as in
  the previous attempt.

- a bug regarding partial application have been fixed.

- some formatting functions have been deprecated, but previous
  versions don't include a replacement, thus the warning has been
  disabled.

We may want to clean up things a bit more, in particular
w.r.t. modules once we can move to OCaml 4.07 as the minimum required
version.

Note that there is a clash between 4.08.0 modules `Option` and `Int`
and Coq's ones. It is not clear if we should resolve that clash or
not, see PR #10469 for more discussion.

On the good side, OCaml 4.08.0 does provide a few interesting
functionalities, including nice new warnings useful for devs.

1 files changed, 2 insertions, 2 deletions

diff --git a/vernac/topfmt.ml b/vernac/topfmt.ml
index 7644f4c5b6..046defc26b 100644
--- a/vernac/topfmt.ml
+++ b/vernac/topfmt.ml
@@ -329,8 +329,8 @@ let init_terminal_output ~color =
       Format.pp_set_print_tags !std_ft true;
       Format.pp_set_print_tags !err_ft true
     end;
-  Format.pp_set_formatter_tag_functions !std_ft (tag_handler !std_ft);
-  Format.pp_set_formatter_tag_functions !err_ft (tag_handler !err_ft)
+  Format.pp_set_formatter_tag_functions !std_ft (tag_handler !std_ft) [@warning "-3"];
+  Format.pp_set_formatter_tag_functions !err_ft (tag_handler !err_ft) [@warning "-3"]
 
 (* Rules for emacs:
    - Debug/info: emacs_quote_info