Nicer spacing when printing array literals

From

    [|x; y; z | def : ty |]

to

    [| x; y; z | def : ty |]

3 files changed, 22 insertions, 2 deletions

diff --git a/printing/ppconstr.ml b/printing/ppconstr.ml
index 6f50f34f36..45d0e39ed6 100644
--- a/printing/ppconstr.ml
+++ b/printing/ppconstr.ml
@@ -681,8 +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) ->
-        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 ++
+        hov 0 (str "[| " ++ prvect_with_sep (fun () -> str "; ") (pr mt ltop) t ++
+               (if not (Array.is_empty t) then str " " else mt()) ++
+               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
diff --git a/test-suite/output/prim_array.out b/test-suite/output/prim_array.out
new file mode 100644
index 0000000000..6c12153ab9
--- /dev/null
+++ b/test-suite/output/prim_array.out
@@ -0,0 +1,9 @@
+[| | 0 : nat |]
+     : array nat
+[| 1; 2; 3 | 0 : nat |]
+     : array nat
+[| | 0 : nat |]@{Set}
+     : array@{Set} nat
+[| bool; list nat | nat : Set |]@{prim_array.4}
+     : array@{prim_array.4} Set
+(* {prim_array.4} |= Set < prim_array.4 *)
diff --git a/test-suite/output/prim_array.v b/test-suite/output/prim_array.v
new file mode 100644
index 0000000000..a82f6a16f1
--- /dev/null
+++ b/test-suite/output/prim_array.v
@@ -0,0 +1,10 @@
+Primitive array := #array_type.
+
+Check [| | 0 |].
+
+Check [| 1; 2; 3 | 0 |].
+
+Set Printing Universes.
+Check [| | 0 |].
+
+Check [| bool; list nat | nat |].