From 1280a492b87f02aac8c8f8496ebd42039762d7e4 Mon Sep 17 00:00:00 2001
From: Gaëtan Gilbert
Date: Mon, 12 Oct 2020 15:13:15 +0200
Subject: Fix printing for empty primitive arrays

Fix #13178
---
 printing/ppconstr.ml               | 10 +++-------
 test-suite/bugs/closed/bug_13178.v |  3 +++
 2 files changed, 6 insertions(+), 7 deletions(-)
 create mode 100644 test-suite/bugs/closed/bug_13178.v

diff --git a/printing/ppconstr.ml b/printing/ppconstr.ml
index 8da1d636f0..6f50f34f36 100644
--- a/printing/ppconstr.ml
+++ b/printing/ppconstr.ml
@@ -681,13 +681,9 @@ let tag_var = tag Tag.variable
       | CDelimiters (sc,a) ->
         return (pr_delimiters sc (pr mt (LevelLe ldelim) a), ldelim)
       | CArray(u, t,def,ty) ->
-        let pp = ref (str " |"++ spc () ++ pr mt ltop def
-          ++ pr_opt_type_spc (pr mt) ty  ++ str " |]" ++ pr_universe_instance u) in
-        for i = Array.length t - 1 downto 1 do
-          pp :=  str ";" ++ pr mt ltop t.(i) ++ !pp
-        done;
-        pp :=  pr mt ltop t.(0) ++ !pp;
-        hov 0 (str "[|" ++ !pp), 0
+        hov 0 (str "[|" ++ prvect_with_sep (fun () -> str "; ") (pr mt ltop) t ++
+               str " |" ++ spc() ++ pr mt ltop def ++ pr_opt_type_spc (pr mt) ty ++
+               str " |]" ++ pr_universe_instance u), 0
     in
     let loc = constr_loc a in
     pr_with_comments ?loc
diff --git a/test-suite/bugs/closed/bug_13178.v b/test-suite/bugs/closed/bug_13178.v
new file mode 100644
index 0000000000..d9c516c362
--- /dev/null
+++ b/test-suite/bugs/closed/bug_13178.v
@@ -0,0 +1,3 @@
+Primitive array := #array_type.
+
+Check [| | 0 |].
-- 
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