Macro ergo::hashset

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

Create a HashSet from a list of elements.

Example

#[macro_use] extern crate maplit;

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