Macro frunk::hlist

macro_rules! hlist {
    () => { ... };
    ($single: expr) => { ... };
    ($first: expr, $( $repeated: expr ), +) => { ... };
}

Returns an HList based on the values passed in.

Helps to avoid having to write nested HCons.

let h = hlist![13.5f32, "hello", Some(41)];
let (h1, (h2, h3)) = h.into_tuple2();
assert_eq!(h1, 13.5f32);
assert_eq!(h2, "hello");
assert_eq!(h3, Some(41))