exhaust 0.1.2

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_newtype_generic!(T: [Copy], core::cell::Cell<T>, core::cell::Cell::new);
impl_newtype_generic!(T: [], core::cell::RefCell<T>, core::cell::RefCell::new);
// Cannot impl for UnsafeCell because it is not Clone.