From 92feebf5fe474bb9c46f2033d6d26302186e496a Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Thu, 17 Jan 2013 12:32:57 +0100
Subject: [PATCH] Fixed regression introduced in
 4d8757bf5da269b35133c6d6be3f06c3465b9ec9 causing crash during support
 material generation

---
 lib/Slic3r/Print/Object.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index e9ca00428..1457a66ec 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -566,7 +566,7 @@ sub generate_support_material {
             # $queue[-1] contains the overhangs of the upper layer, regardless of any empty interface layers
             # $queue[0] contains the overhangs of the first upper layer above the empty interface layers
             $layers_interfaces{$i} = diff_ex(
-                [ @{ $queue[-1] || [] } ],
+                [ map @$_, @{ $queue[-1] || [] } ],
                 [ map @$_, @current_layer_offsetted_slices ],
             );