Macro multi_index_container 

macro_rules! multi_index_container {
    (
        $(#[$meta:meta])*
        $vis:vis $map_name:ident<$value_type:ty> {
            $(unique $unique_name:ident: $unique_key_type:ty => |$unique_param:ident| $unique_expr:expr,)*
            $(non_unique $non_unique_name:ident: $non_unique_key_type:ty => |$non_unique_param:ident| $non_unique_expr:expr,)*
            $(unique_ordered $unique_ordered_name:ident: $unique_ordered_key_type:ty => |$unique_ordered_param:ident| $unique_ordered_expr:expr,)*
            $(non_unique_ordered $non_unique_ordered_name:ident: $non_unique_ordered_key_type:ty => |$non_unique_ordered_param:ident| $non_unique_ordered_expr:expr,)*
        }
    ) => { ... };
}

Macro to define a multi-index map with unique and non-unique indexes