Rust Quick Start Guide

Any can store almost anything

The Rust compiler automatically implements Any for any data type, unless that data type contains non-static references. So, our Forward, Turn, and Stop structures that we used in the trait objects section already automatically implement Any, but something like this would not:

pub struct DoesNotHaveAnyTrait<'a> {    pub name: &'a str,    pub count: i32,}

More accurately, DoesNotHaveAnyTrait only has the Any trait when 'a is equal to 'static, which it is if we use a simple string expression such as this is a static string to initialize it, but not if we use some other mechanism for retrieving or constructing an &str value.

The error the compiler will give if we try something impossible along these lines will probably ...