// in core::range

pub struct RangeToInclusive<Idx> {
    pub last: Idx,
}

impl<Idx: fmt::Debug> fmt::Debug for RangeInclusive<Idx> { /* ... */ }

impl<Idx: PartialOrd<Idx>> RangeToInclusive<Idx> {
    pub const fn contains<U>(&self, item: &U) -> bool
    where
        Idx: [const] PartialOrd<U>,
        U: ?Sized + [const] PartialOrd<Idx>;
}

impl<T> const RangeBounds<T> for RangeToInclusive<T> { /* ... */ }
impl<T> const RangeBounds<T> for RangeToInclusive<&T> { /* ... */ }

impl<T> const From<RangeToInclusive<T>> for legacy::RangeToInclusive<T> { /* ... */ }
impl<T> const From<legacy::RangeToInclusive<T>> for RangeToInclusive<T> { /* ... */ }

unsafe impl<T> const SliceIndex<[T]> for range::RangeToInclusive<usize> {
    type Output = [T];
    /* ... */
}