implement Clone

src/lib.rs

@@ -36,13 +36,13 @@ use text::{Font, TextDirection};
 use tile::Tile;
 use variable::Variable;
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Instance {
     position: Position,
     id: String, // item / ending.rs id
 }
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct ExitInstance {
     position: Position,
     exit: Exit,