macro_rules! options_field {
("" $obj:expr, $alias:literal, $value:expr) => { ... };
($field:tt $obj:expr, $alias:literal, $value:expr) => { ... };
}macro_rules! options_field {
("" $obj:expr, $alias:literal, $value:expr) => { ... };
($field:tt $obj:expr, $alias:literal, $value:expr) => { ... };
}