//@ functions provided by `Send`. What the trait says is that types which are `Send` can be safely
//@ sent to another thread without causing trouble.
//@ Of course, all the primitive data-types are `Send`. So is `Arc`, which is why Rust accepted our
//@ functions provided by `Send`. What the trait says is that types which are `Send` can be safely
//@ sent to another thread without causing trouble.
//@ Of course, all the primitive data-types are `Send`. So is `Arc`, which is why Rust accepted our