stackbox_2 0.2.2

`&own`ing references in stable Rust - no_std-friendly Box
Documentation 
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use crate::prelude::*;

pub
struct Iter<'frame, Item : 'frame> (
    StackBox<'frame, [Item]>,
);

impl<'frame, Item : 'frame> Iterator for Iter<'frame, Item> {
    type Item = Item;

    #[inline]
    fn next (self: &'_ mut Iter<'frame, Item>)
      -> Option<Item>
    {
        self.0.stackbox_pop_first()
    }

    #[inline]
    fn size_hint(self: &'_ Iter<'frame, Item>)
      -> (usize, Option<usize>)
    {
        (self.0.len(), Some(self.0.len()))
    }
}

impl<'frame, Item: 'frame> ExactSizeIterator for Iter<'frame, Item> {
    #[inline]
    fn len(&self)
      -> usize
    {
        self.0.len()
    }
}

impl<'frame, Item: 'frame> DoubleEndedIterator for Iter<'frame, Item> {
    fn next_back(&mut self)
      -> Option<Self::Item>
    {
        self.0.stackbox_pop_last()
    }
}

impl<'frame, Item : 'frame> IntoIterator
    for StackBox<'frame, [Item]>
{
    type IntoIter = Iter<'frame, Item>;
    type Item = Item;

    #[inline]
    fn into_iter (self: StackBox<'frame, [Item]>)
      -> Iter<'frame, Item>
    {
        Iter(self)
    }
}

#[cfg(test)]
mod tests {
    #[test]
    fn doctest_for_miri ()
    {
        use ::stackbox_2::prelude::*;

        stackbox!(let boxed_slice: StackBox<'_, [_]> = [
            String::from("Hello, "),
            String::from("World!"),
        ]);
        for s in boxed_slice {
            println!("{}", s);
            drop::<String>(s);
        }
    }
}