id_effect 0.2.0

Effect<A, E, R> (sync + async), context/layers, pipe — interpreter-style, no bundled executor
Documentation 
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//! [`Nil`] / [`Cons`] — heterogeneous list spine (`Stratum 3.3`).

/// End of the heterogeneous list.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash)]
pub struct Nil;

/// Head `H` followed by tail list `T`.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct Cons<H, T>(pub H, pub T);