diff --git a/lib/Slic3r/Layer/Region.pm b/lib/Slic3r/Layer/Region.pm
index 39cec3d61a..3d089cc82c 100644
--- a/lib/Slic3r/Layer/Region.pm
+++ b/lib/Slic3r/Layer/Region.pm
@@ -302,7 +302,7 @@ sub make_perimeters {
                         height          => $self->height,
                     );
                 }
-        
+                
                 # reapply the nearest point search for starting point
                 # (clone because the collection gets DESTROY'ed)
                 # We allow polyline reversal because Clipper may have randomly
diff --git a/lib/Slic3r/Polygon.pm b/lib/Slic3r/Polygon.pm
index c12d3dcaf2..124d9ae996 100644
--- a/lib/Slic3r/Polygon.pm
+++ b/lib/Slic3r/Polygon.pm
@@ -15,6 +15,11 @@ sub wkt {
     return sprintf "POLYGON((%s))", join ',', map "$_->[0] $_->[1]", @$self;
 }
 
+sub dump_perl {
+    my $self = shift;
+    return sprintf "[%s]", join ',', map "[$_->[0],$_->[1]]", @$self;
+}
+
 sub grow {
     my $self = shift;
     return $self->split_at_first_point->grow(@_);
diff --git a/xs/t/11_clipper.t b/xs/t/11_clipper.t
index ca00bc6e3e..f2f7686a85 100644
--- a/xs/t/11_clipper.t
+++ b/xs/t/11_clipper.t
@@ -4,7 +4,7 @@ use strict;
 use warnings;
 
 use Slic3r::XS;
-use Test::More tests => 17;
+use Test::More tests => 19;
 
 my $square = Slic3r::Polygon->new(  # ccw
     [200, 100],
@@ -155,4 +155,26 @@ if (0) {  # Clipper does not preserve polyline orientation
     }
 }
 
+{
+    my $subject = Slic3r::Polyline->new(
+        [44735000,31936670],[55270000,31936670],[55270000,25270000],[74730000,25270000],[74730000,44730000],[68063296,44730000],[68063296,55270000],[74730000,55270000],[74730000,74730000],[55270000,74730000],[55270000,68063296],[44730000,68063296],[44730000,74730000],[25270000,74730000],[25270000,55270000],[31936670,55270000],[31936670,44730000],[25270000,44730000],[25270000,25270000],[44730000,25270000],[44730000,31936670]
+    );
+    my $clip = [
+        Slic3r::Polygon->new([75200000,45200000],[54800000,45200000],[54800000,24800000],[75200000,24800000]),
+    ];
+    my $result = Slic3r::Geometry::Clipper::intersection_pl([$subject], $clip);
+    is scalar(@$result), 1, 'intersection_pl - result is not empty';
+}
+
+{
+    my $subject = Slic3r::Polygon->new(
+        [44730000,31936670],[55270000,31936670],[55270000,25270000],[74730000,25270000],[74730000,44730000],[68063296,44730000],[68063296,55270000],[74730000,55270000],[74730000,74730000],[55270000,74730000],[55270000,68063296],[44730000,68063296],[44730000,74730000],[25270000,74730000],[25270000,55270000],[31936670,55270000],[31936670,44730000],[25270000,44730000],[25270000,25270000],[44730000,25270000]
+    );
+    my $clip = [
+        Slic3r::Polygon->new([75200000,45200000],[54800000,45200000],[54800000,24800000],[75200000,24800000]),
+    ];
+    my $result = Slic3r::Geometry::Clipper::intersection_ppl([$subject], $clip);
+    is scalar(@$result), 1, 'intersection_ppl - result is not empty';
+}
+
 __END__