effectful 0.2.0

Effect<A, E, R> (sync + async), context/layers, pipe — interpreter-style, no bundled executor
Documentation 
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//! Ex 024 — `get_mut` mutates a tagged cell in place.
use effectful::{Service, ctx};

#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash, Service)]
struct ScoreKey;

fn main() {
  let mut env = ctx!(ScoreKey => 10_i32);
  *env.get_mut::<ScoreKey>() = 42;
  assert_eq!(*env.get::<ScoreKey>(), 42);
  println!("024_get_mut ok");
}