Macro top_level_options

macro_rules! top_level_options {
    ( $( #[$top_level_attr:meta] )* pub struct Options { $(
        $( #[$attr:meta] )*
        $opt:ident : $t:ty [$dep_tracking_marker:ident $( $tmod:ident $variant:ident )?],
    )* } ) => { ... };
}