Fix off by one error

src/parser/mod.rs

@@ -166,7 +166,7 @@ impl Ast {
             },
             Ast::List(Localised { item, location }) => {
                 println!("{} List ({}:{})", prefix_, location.line_start(), location.col_start());
-                for i in 0..item.len()-2 {
+                for i in 0..item.len()-1 {
                     item[i].pretty_print(Some(&(body_prefix_.to_owned() + &String::from(" ├─ "))), Some(&(body_prefix_.to_owned() + &String::from(" │  "))));
                 }
                 item[item.len()-1].pretty_print(Some(&(body_prefix_.to_owned() + &String::from(" ╰─ "))), Some(&(body_prefix_.to_owned() + &String::from("    "))));