Ajout des instructions.

src/astprinter.rs

@@ -1,4 +1,5 @@
 use crate::expr::{Binary, Expr, ExprVisitor, Grouping, Literal, Unary};
+use crate::stmt::{ExpressionStatement, PrintStatement, StatementVisitor};
 
 pub struct ASTPrinter {
     pub(crate) depth: u32
@@ -59,4 +60,22 @@ impl ExprVisitor<()> for ASTPrinter {
             Expr::UnaryExpr(u) => { self.visit_unary(u); }
         }
     }
+}
+
+impl StatementVisitor<()> for ASTPrinter {
+    fn visit_expr_stmt(&mut self, e: &ExpressionStatement) -> () {
+        println!("{} EXPR_STMT(", self.ast_tab());
+        self.depth+=1;
+        self.visit_expr(&e.expr);
+        self.depth-=1;
+        print!(") ");
+    }
+
+    fn visit_print(&mut self, p: &PrintStatement) -> () {
+        println!("{} EXPR_STMT(", self.ast_tab());
+        self.depth+=1;
+        self.visit_expr(&p.expr);
+        self.depth-=1;
+        print!(") ");
+    }
 }