Use write_str

src/errors.rs

@@ -130,7 +130,7 @@ macro_rules! ascom_error_codes {
             fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                 match *self {
                     $(
-                        Self::$name => write!(f, "{}", stringify!($name)),
+                        Self::$name => f.write_str(stringify!($name)),
                     )*
                     _ => match self.as_driver_error() {
                         Ok(driver_code) => write!(f, "DRIVER_ERROR[{driver_code}]"),