Macro ergo::indexset

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

Create an IndexSet from a list of values

Example

#[macro_use] extern crate indexmap;

let set = indexset!{
    "a",
    "b",
};
assert!(set.contains("a"));
assert!(set.contains("b"));
assert!(!set.contains("c"));

// "a" is the first value
assert_eq!(set.iter().next(), Some(&"a"));