effectful 0.3.0

Effect<A, E, R> (sync + async), context/layers, pipe — interpreter-style, no bundled executor
Documentation 
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use effectful::{Effect, effect, run_blocking, succeed};

fn main() {
  let program: Effect<i32, (), ()> = effect! {
    let x = { bind* succeed(20_i32) };
    x + 22
  };

  assert_eq!(run_blocking(program, ()), Ok(42));
}