chainit

This essentially solves the "PLEASE JUST MAKE THIS SHI CHAIN!!!!!!!" situations.

Just use the chained() function and start chaining everything.

use chainit::chained;

fn do_something() {}

fn main() {
    let res = chained(100)
        .chain(|item| item - 1)
        .chain(|mut item| {
            item += 1;
            do_something();

            item
        })
        .take();

    assert_eq!(res, 100);
}