use std::borrow::Cow;

struct Foo<'a>(Cow<'a, [u8]>);
struct FooList<'a>(Vec<Foo<'a>>);

impl<'a> std::borrow::ToOwned for Foo<'a> {
    type Owned = Foo<'static>;

    fn to_owned(&self) -> Foo<'static> {
        Foo(self.0.to_vec().into())
    }
}


impl<'a> Clone for FooList<'a> {
    fn clone(&self) -> FooList<'static> {
        FooList(self.0.iter().map(|foo| {
            let vec = foo.0.clone().into_owned();
            Foo(vec.into())
        }).collect())
    }
}

fn main() {

}