[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.

3 files changed, 6 insertions, 6 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. *)
diff --git a/ide/session.ml b/ide/session.ml
index 3792730455..a9c106a765 100644
--- a/ide/session.ml
+++ b/ide/session.ml
@@ -275,9 +275,9 @@ let make_table_widget ?sort cd cb =
   let make_sorting i (_, c) =
     let sort (store : GTree.model) it1 it2 = match c with
     | `IntC c ->
-      Pervasives.compare (store#get ~row:it1 ~column:c) (store#get ~row:it2 ~column:c)
+      compare (store#get ~row:it1 ~column:c) (store#get ~row:it2 ~column:c)
     | `StringC c ->
-      Pervasives.compare (store#get ~row:it1 ~column:c) (store#get ~row:it2 ~column:c)
+      compare (store#get ~row:it1 ~column:c) (store#get ~row:it2 ~column:c)
     in
     store#set_sort_func i sort
   in
diff --git a/ide/wg_Completion.ml b/ide/wg_Completion.ml
index 7758d89ed8..98390e810f 100644
--- a/ide/wg_Completion.ml
+++ b/ide/wg_Completion.ml
@@ -15,7 +15,7 @@ struct
     (* we use first size, then usual comparison *)
     let d = String.length s1 - String.length s2 in
     if d <> 0 then d
-    else Pervasives.compare s1 s2
+    else compare s1 s2
 end
 
 module Proposals = Set.Make(StringOrd)