unused 0.1.0

Allows for unused generic parameters that do not act like they are owned.
Documentation 
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use core::cmp::Ordering;
use core::fmt;
use core::hash::{Hash, Hasher};

use crate::inner::UnusedInner;
use crate::End;

/// An `UnusedInner` that is covariant over `T`
pub struct Covariant<T: ?Sized, N: UnusedInner> {
    _t: fn() -> T,
    next: N,
}

impl<T: ?Sized, N: UnusedInner> UnusedInner for Covariant<T, N> {
    fn inconstruable(self) -> End {
        self.next.inconstruable()
    }
}

impl<T: ?Sized, N: UnusedInner> fmt::Debug for Covariant<T, N> {
    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self.inconstruable() {}
    }
}

impl<T: ?Sized, N: UnusedInner> fmt::Display for Covariant<T, N> {
    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self.inconstruable() {}
    }
}

impl<T: ?Sized, N: UnusedInner> Clone for Covariant<T, N> {
    fn clone(&self) -> Self {
        match self.inconstruable() {}
    }
}

impl<T: ?Sized, N: UnusedInner> Copy for Covariant<T, N> {}

impl<T: ?Sized, N: UnusedInner> PartialEq for Covariant<T, N> {
    fn eq(&self, _other: &Self) -> bool {
        match self.inconstruable() {}
    }
}

impl<T: ?Sized, N: UnusedInner> Eq for Covariant<T, N> {}

impl<T: ?Sized, N: UnusedInner> PartialOrd for Covariant<T, N> {
    fn partial_cmp(&self, _other: &Self) -> Option<Ordering> {
        match self.inconstruable() {}
    }
}

impl<T: ?Sized, N: UnusedInner> Ord for Covariant<T, N> {
    fn cmp(&self, _other: &Self) -> Ordering {
        match self.inconstruable() {}
    }
}

impl<T: ?Sized, N: UnusedInner> Hash for Covariant<T, N> {
    fn hash<H: Hasher>(&self, _state: &mut H) {
        match self.inconstruable() {}
    }
}