Default implementations on traits

[tarrball]

Are there code redundancies that could be cleaned up with default implementations on traits?

https://doc.rust-lang.org/book/ch17-03-oo-design-patterns.html

trait State {
    // default implementation
    fn content<'a>(&self, post: &'a Post) -> &'a str {
        ""
    }
}

struct Published {}

impl State for Published {
    fn content<'a>(&self, post: &'a Post) -> &'a str {
        &post.content
    }
}