[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.

2 files changed, 4 insertions, 4 deletions

diff --git a/plugins/omega/coq_omega.ml b/plugins/omega/coq_omega.ml
index 6aec83318c..776bd0a829 100644
--- a/plugins/omega/coq_omega.ml
+++ b/plugins/omega/coq_omega.ml
@@ -500,7 +500,7 @@ let context sigma operation path (t : constr) =
       | (p, Fix ((_,n as ln),(tys,lna,v))) ->
 	  let l = Array.length v in
 	  let v' = Array.copy v in
-          v'.(n)<- loop (Pervasives.(+) i l) p v.(n); (mkFix (ln,(tys,lna,v')))
+          v'.(n)<- loop (Util.(+) i l) p v.(n); (mkFix (ln,(tys,lna,v')))
       | ((P_TYPE :: p), Prod (n,t,c)) ->
           (mkProd (n,loop i p t,c))
       | ((P_TYPE :: p), Lambda (n,t,c)) ->
@@ -684,7 +684,7 @@ let simpl_coeffs path_init path_k =
           | _ -> assert false)
       | _ -> assert false
   in
-  let n = Pervasives.(-) (List.length path_k) (List.length path_init) in
+  let n = Util.(-) (List.length path_k) (List.length path_init) in
   let newc = context sigma (fun _ t -> loop n t) (List.rev path_init) (pf_concl gl)
   in
   convert_concl ~check:false newc DEFAULTcast
@@ -1000,7 +1000,7 @@ let shrink_pair p f1 f2 =
     | t1,t2 ->
 	begin
 	  oprint t1; print_newline (); oprint t2; print_newline ();
-	  flush Pervasives.stdout; CErrors.user_err Pp.(str "shrink.1")
+          flush stdout; CErrors.user_err Pp.(str "shrink.1")
 	end
 
 let reduce_factor p = function
diff --git a/plugins/omega/omega.ml b/plugins/omega/omega.ml
index cec87221f0..05c31062fc 100644
--- a/plugins/omega/omega.ml
+++ b/plugins/omega/omega.ml
@@ -242,7 +242,7 @@ let add_event, history, clear_history =
   (fun () -> !accu),
   (fun () -> accu := [])
 
-let nf_linear = List.sort (fun x y -> Pervasives.(-) y.v x.v)
+let nf_linear = List.sort (fun x y -> Util.(-) y.v x.v)
 
 let nf ((b : bool),(e,(x : int))) = (b,(nf_linear e,x))