How to derive Debug for struct with `&'a dyn Trait`?

help
1 
trait A {}

impl std::fmt::Debug for dyn A {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         todo!()
    }
}

#[derive(Debug)]
pub struct B<'a> {
    pub values: &'a dyn A,
}

fn main() {}

this is not compiling, and I do not have a good idea on how to address it.

Playground: Rust Playground

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2

Some options:

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3

Thanks!

I was missing the lifetime identifier, the below is enough:

trait A {}

impl std::fmt::Debug for dyn A + '_ {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         todo!()
    }
}
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