Macro ergo::indexmap

macro_rules! indexmap {
    ( @ single $ ( $ x : tt ) * ) => { ... };
    ( @ count $ ( $ rest : expr ) , *
) => { ... };
    ( $ ( $ key : expr => $ value : expr , ) + ) => { ... };
    (
$ ( $ key : expr => $ value : expr ) , * ) => { ... };
}

Create an IndexMap from a list of key-value pairs

Example

#[macro_use] extern crate indexmap;

let map = indexmap!{
    "a" => 1,
    "b" => 2,
};
assert_eq!(map["a"], 1);
assert_eq!(map["b"], 2);
assert_eq!(map.get("c"), None);

// "a" is the first key
assert_eq!(map.keys().next(), Some(&"a"));