Macro divina_config::get_enum_or_none

macro_rules! get_enum_or_none {
    ($table:ident, $key:expr, $assign_to:tt, $from_u8:tt, $error_message:expr, $required:expr) => { ... };
    (
    $table:ident,
    $from_table:expr,
    $key:expr,
    $assign_to:tt,
    $from_u8:tt,
    $error_message:expr,
    $required:expr
  ) => { ... };
}