macro_rules! ngettext {
 ($singular:expr, ( $($singular_names:ident = $singular_values:expr),* ), $plural:expr, ( $($plural_names:ident = $plural_values:expr),* ), $n:expr) =>
 ((format!($singular, $( $singular_names = $singular_values ),*), format!($plural, $( $plural_names = $plural_values ),*), $n));
}

fn main() {
    let name = "Alice";
    let names = ["Bob", "Cat"];
    let x = ngettext!(
        "singular {item}",
        (item = name),
        "plural {items:?}",
        (items = names),
        5
    );

    println!("{:?}", x)
}