[pornel]

Rust doesn't have syntax for passing by value vs passing by reference. The syntax you're thinking of is instead for lending vs moving, e.g. moving `Box<T>` is still passing values by reference (but owned), and `&str` is a small copyable struct passed by value (but borrowed).

It's not the surprise-copy-horror you'd expect, because there are no copy constructors, and nothing large is ever copied implicitly (you have to call `.clone()` or implement `Copy` trait for a type).

The move semantics can ensure there exists only one owning pointer to each object. It can be statically known who owns the object, and most importantly, who has to free it.