exhaust 0.1.2

Trait and derive macro for working with all possible values of a type (exhaustive enumeration).
Documentation 
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extern crate alloc;
use alloc::borrow::Cow;

mod helper;
use helper::check_double;

#[test]
fn impl_cow() {
    check_double::<Cow<'_, bool>>(vec![Cow::Owned(false), Cow::Owned(true)]);
}