How to correctly return an iterator (or any other trait) from a function in Rust?

Hello, colleagues! I started learning Rust and encountered a problem that seems very strange to me. I'm trying to write a function that returns an iterator, but the compiler keeps complaining. Here's what I want to do: I have a vector of numbers, and I want to filter even numbers and return an iterator over them. I wrote this code: ```rust fn get_even_numbers(numbers: Vec) -> Iterator { numbers.into_iter().filter(|&x| x % 2 == 0) } ``` But the compiler gives an error: ``` error[E0277]: the size for values of type `(dyn Iterator + 'static)` cannot be known at compilation time ``` I understand that traits are not fixed-size types, but how do I correctly return an iterator? I've seen that in some places `Box>` is used,