1 files changed, 4 insertions, 1 deletions
diff --git a/src/lib.rs b/src/lib.rs
index 76b35c9..fb7d5a2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,12 @@
+#![feature(box_syntax)]
+
 use color::Color;
 
 pub mod color;
-pub mod transform;
 pub mod pattern;
+pub mod transform;
 
 pub trait Sample {
     fn sample(&mut self, x: f64, y: f64) -> Color;
+    fn clone(&self) -> Box<dyn Sample>;
 }