Rust Quick Start Guide

But to access it we have to already know about the real data type

Getting back to our example, we'll create our array of driving directions, and we'll add a something else that isn't a driving direction, just to prove that we can.

Here, we have an array of Any trait references containing driving directions and one other thing:

use std::any::Any;//...pub struct DoesHaveAnyTrait { pub name: String, pub count: i32,}//...let okay = String::from("okay");let directions: [&dyn Any; 7] = [    &Forward{ blocks: 5 },    &Turn{ slight: true, right: false },    &Forward{ blocks: 1 },    &Turn{ slight: false, right: true },    &Forward{ blocks: 2 },    &Stop{},    &DoesHaveAnyTrait{ name: okay, count: 16},];

So far, it looks rather similar to our trait object example, which ...