From ae1960c4fb1c65cd68fe39bc2f6d180682625d72 Mon Sep 17 00:00:00 2001
From: gareuselesinge
Date: Thu, 18 Apr 2013 08:48:25 +0000
Subject: Only arguments declared as implicit can be renamed

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@16427 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 toplevel/vernacentries.ml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/toplevel/vernacentries.ml b/toplevel/vernacentries.ml
index a3aa6607e8..498c653ab0 100644
--- a/toplevel/vernacentries.ml
+++ b/toplevel/vernacentries.ml
@@ -1007,7 +1007,11 @@ let vernac_declare_arguments locality r l nargs flags =
             error ("Argument "^Id.to_string x^" cannot be declared implicit.")
         | (Name iid, _,_, true, max), Name id ->
            b || not (Id.equal iid id), Some (ExplByName id, max, false)
-        | (Name iid, _,_, _, _), Name id -> b || not (Id.equal iid id), None
+        | (Name iid, _,_, false, _), Name id ->
+           if not (Id.equal iid id) then
+             error("Argument "^Id.to_string id^" cannot be renamed to "^
+               Id.to_string iid^" because it is not declared as implicit");
+           b, None
         | _ -> b, None)
         sr (List.combine il inf_names) in
       sr || sr', List.map_filter (fun x -> x) impl)
-- 
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