--- a/rust/landgen/src/outline.rs	Wed Jan 04 15:26:30 2023 +0100
+++ b/rust/landgen/src/outline.rs	Mon Jan 30 15:50:14 2023 +0100
@@ -287,7 +287,7 @@
         }
     }
 
-    pub fn draw<T: Copy + PartialEq>(&self, land: &mut Land2D<T>, value: T) {
+    pub fn draw<T: Copy + PartialEq + Default>(&self, land: &mut Land2D<T>, value: T) {
         for segment in self.segments_iter() {
             land.draw_line(segment, value);
         }