Macro nonempty::nonempty

macro_rules! nonempty {
    ($h:expr, $( $x:expr ),* $(,)?) => { ... };
    ($h:expr) => { ... };
}

Like the vec! macro, but enforces at least one argument. A nice short-hand for constructing NonEmpty values.

use nonempty::{NonEmpty, nonempty};

let v = nonempty![1, 2, 3];
assert_eq!(v, NonEmpty { head: 1, tail: vec![2, 3] });

let v = nonempty![1];
assert_eq!(v, NonEmpty { head: 1, tail: Vec::new() });

// Accepts trailing commas
let v = nonempty![1,];
assert_eq!(v, NonEmpty { head: 1, tail: Vec::new() });

// Doesn't compile!
// let v = nonempty![];