Macro btreeset 

macro_rules! btreeset {
    () => { ... };
    ($($key:expr,)+) => { ... };
    ($($key:expr),*) => { ... };
}

Generates the code to initialize a BTreeSet.

The macro can be followed by parentheses or square brackets.

Example

let days = btreeset!["Monday", "Tuesday", "Wednesday"];
// => BTreeSet::from(["Monday", "Tuesday", "Wednesday", ])
assert_eq!(days, BTreeSet::from(["Monday", "Tuesday", "Wednesday"]));