Macro time::format_description::parse::format_item::component_definition

macro_rules! component_definition {
    (@if_required required then { $($then:tt)* } $(else { $($else:tt)* })?) => { ... };
    (@if_required then { $($then:tt)* } $(else { $($else:tt)* })?) => { ... };
    (@if_from_str from_str then { $($then:tt)* } $(else { $($else:tt)* })?) => { ... };
    (@if_from_str then { $($then:tt)* } $(else { $($else:tt)* })?) => { ... };
    ($vis:vis enum $name:ident {
        $($variant:ident = $parse_variant:literal {$(
            $(#[$required:tt])?
            $field:ident = $parse_field:literal:
            Option<$(#[$from_str:tt])? $field_type:ty>
            => $target_field:ident
        ),* $(,)?}),* $(,)?
    }) => { ... };
}

Available on (crate features formatting or parsing) and crate feature alloc only.

Declare the Component struct.