Macro union::union

macro_rules! union {
    #[proc_macro_hack(support_nested)] => { ... };
}

Use to combine sync results.

extern crate union;

use union::union;

fn main() {
    let product = union! {
        Ok::<_,u8>(2) |> |v| v + 2,
        Ok::<_,u8>(3),
        Ok::<_,u8>(4),
        map => |a, b, c| a * b * c
    }.unwrap();

    assert_eq!(product, 48);
}