effectful 0.3.0

Effect<A, E, R> (sync + async), context/layers, pipe — interpreter-style, no bundled executor
Documentation 
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//! Ex 018 — `Exit` models completed runs (`succeed` / `fail`).
use effectful::{Exit, run_test, succeed};

fn main() {
  assert_eq!(
    run_test(succeed::<i32, (), ()>(42_i32), ()),
    Exit::succeed(42)
  );
  println!("018_exit_type ok");
}