exhaust 0.2.3

Trait and derive macro for working with all possible values of a type (exhaustive enumeration).
Documentation 
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use crate::patterns::{impl_newtype_generic, impl_via_array};

impl_newtype_generic!(T: [], core::cmp::Reverse<T>, core::cmp::Reverse);

impl_via_array!(
    core::cmp::Ordering,
    [Self::Less, Self::Equal, Self::Greater]
);