From 751ad4098768569450306b7e269081bbac81ea71 Mon Sep 17 00:00:00 2001
From: SimonBoulier
Date: Tue, 7 Jan 2020 10:07:08 +0100
Subject: Turn trailing implicit warning into an error

---
 interp/impargs.ml | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'interp')

diff --git a/interp/impargs.ml b/interp/impargs.ml
index df28b32f81..b22407c2b7 100644
--- a/interp/impargs.ml
+++ b/interp/impargs.ml
@@ -648,9 +648,8 @@ let maybe_declare_manual_implicits local ref ?enriching l =
 
 (* TODO: either turn these warnings on and document them, or handle these cases sensibly *)
 
-let warn_set_maximal_deprecated =
-  CWarnings.create ~name:"set-maximal-deprecated" ~category:"deprecated"
-    (fun i -> strbrk ("Argument number " ^ string_of_int i ^ " is a trailing implicit so must be maximal"))
+let msg_trailing_implicit id =
+  user_err (strbrk ("Argument " ^ Names.Id.to_string id ^ " is a trailing implicit, so it can't be declared non maximal. Please use { } instead of [ ]."))
 
 type implicit_kind = Implicit | MaximallyImplicit | NotImplicit
 
@@ -662,7 +661,7 @@ let compute_implicit_statuses autoimps l =
     | Name id :: autoimps, Implicit :: manualimps ->
        let imps' = aux (i+1) (autoimps, manualimps) in
        let max = set_maximality imps' false in
-       if max then warn_set_maximal_deprecated i;
+       if max then msg_trailing_implicit id;
        Some (ExplByName id, Manual, (max, true)) :: imps'
     | Anonymous :: _, (Implicit | MaximallyImplicit) :: _ ->
        user_err ~hdr:"set_implicits"
-- 
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