No, it's more related to the fact that Rust allows you to use traits in both a statically- and dynamically-dispatched way. You can read some more on the topic h

No, it's more related to the fact that Rust allows you to use traits in both a statically- and dynamically-dispatched way. You can read some more on the topic here: http://aturon.github.io/blog/2015/09/28/impl-trait/ http://aturon.github.io/blog/2015/09/28/impl-trait/