trait Trait {}

type Foo = dyn Trait;

struct Bar {
    baz: Vec<Box<Foo>>,
}

impl Bar {
pub fn buzz(&self) -> &[&Foo] {
    unsafe {
        //std::slice::from_raw_parts(self.baz.as_ptr() as *const _, self.baz.len())
        &*(self.baz.as_ptr() as *const Vec<&Foo>)
    }
}
}

fn main() {
    let bar = Bar { baz: vec![] };
    for _ in bar.buzz() {
        println!(".");
    }
}