Macro wlist 

macro_rules! wlist {
    () => { ... };
    ($( ($weight:expr, $value:expr) ),* $(,)?) => { ... };
}

Construct a WeightedList from the provided (weight, value) pairs.

Usage

let wl = wlist![
    (2, "sup"),
    (3, "nova"),
    (5, "shard"),
];
 
let empty: WeightedList<(), usize> = wlist![];