From 75b49b14987ec9467ec5916609da8ce3136d3e11 Mon Sep 17 00:00:00 2001
From: Maxime Dénès
Date: Sun, 6 Nov 2016 13:46:25 +0100
Subject: Fix #5181: [Arguments] no longer correctly checks the length of
 arguments lists

---
 test-suite/bugs/closed/5181.v | 3 +++
 toplevel/vernacentries.ml     | 3 +--
 2 files changed, 4 insertions(+), 2 deletions(-)
 create mode 100644 test-suite/bugs/closed/5181.v

diff --git a/test-suite/bugs/closed/5181.v b/test-suite/bugs/closed/5181.v
new file mode 100644
index 0000000000..0e6d471979
--- /dev/null
+++ b/test-suite/bugs/closed/5181.v
@@ -0,0 +1,3 @@
+Definition foo (x y : nat) := x.
+Fail Arguments foo {_} : assert.
+
diff --git a/toplevel/vernacentries.ml b/toplevel/vernacentries.ml
index 851d7557a5..86b86e572d 100644
--- a/toplevel/vernacentries.ml
+++ b/toplevel/vernacentries.ml
@@ -1085,8 +1085,7 @@ let vernac_arguments locality reference args more_implicits nargs_for_red flags
        else error "Argument lists should agree on the names they provide."
   in
 
-  let initial = List.make num_args Anonymous in
-  let names = List.fold_left names_union initial names in
+  let names = List.fold_left names_union [] names in
 
   let rec rename prev_names names =
     match prev_names, names with
-- 
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