Macro join::try_join

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

Use to combine results.

extern crate join;

use join::try_join;

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

    assert_eq!(product, 48);
}