Trait

• A Trait expresses a way to call something (think to an inteface). It CAN'T be instantiated.
• As a parameter it CAN'T be unsized:

trait MyTrait { fn bar() {}
}

// WON'T WORK ❌
fn foo(myTrait: MyTrait) -> { 
	myTrait.bar();
}

// WILL WORK ✅
fn foo<T: MyTrait>(myTrait: T) -> { 
	myTrait.bar();
}