Ajout des instructions.

src/expr.rs

@@ -1,11 +1,13 @@
 use crate::token::Token;
 
+#[derive(Clone)]
 pub struct Binary {
     pub left: Box<Expr>,
     pub operator: Token,
     pub right: Box<Expr>,
 }
 
+#[derive(Clone)]
 pub struct Grouping {
     pub expression: Box<Expr>,
 }
@@ -18,11 +20,13 @@ pub enum Literal {
     LiteralNil,
 }
 
+#[derive(Clone)]
 pub struct Unary {
     pub operator: Token,
     pub right: Box<Expr>,
 }
 
+#[derive(Clone)]
 pub enum Expr {
     BinaryExpr(Binary),
     GroupingExpr(Grouping),