add println

result

@@ -1 +0,0 @@
-/nix/store/ysnlms9yadny09279xks5h0k1dzx1iqa-puyo-lang-0.1.0

src/eval.rs

@@ -198,6 +198,9 @@ fn eval<'a>(insts: &'a [Inst<'a>], stack: &mut Stack<'a>, env: &Rc<RefCell<Env<'
                 "print" => {
                     print!("{}", stack.pop_default());
                 }
+                "println" => {
+                    println!("{}", stack.pop_default());
+                }
                 "put" => {
                     #[allow(clippy::cast_sign_loss, clippy::cast_possible_truncation)]
                     let byte = stack.pop_num() as u8;