[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, 3 insertions, 3 deletions

diff --git a/ide/protocol/richpp.ml b/ide/protocol/richpp.ml
index 507b985d2f..463d93af0d 100644
--- a/ide/protocol/richpp.ml
+++ b/ide/protocol/richpp.ml
@@ -94,7 +94,7 @@ let rich_pp width ppcmds =
     print_close_tag = ignore;
   } in
 
-  pp_set_formatter_tag_functions ft tag_functions;
+  pp_set_formatter_tag_functions ft tag_functions [@warning "-3"];
   pp_set_mark_tags ft true;
 
   (* Setting the formatter *)
@@ -107,9 +107,9 @@ let rich_pp width ppcmds =
   (* The whole output must be a valid document. To that
      end, we nest the document inside <pp> tags. *)
   pp_open_box ft 0;
-  pp_open_tag ft "pp";
+  pp_open_tag ft "pp" [@warning "-3"];
   Pp.(pp_with ft ppcmds);
-  pp_close_tag ft ();
+  pp_close_tag ft () [@warning "-3"];
   pp_close_box ft ();
 
   (* Get the resulting XML tree. *)