There is so called marker traits Send and Sync that are used to track whether something is tread-safe or not. https://doc.rust-lang.org/beta/nomicon/send-and-sy

There is so called marker traits Send and Sync that are used to track whether something is tread-safe or not. https://doc.rust-lang.org/beta/nomicon/send-and-sync.html https://doc.rust-lang.org/beta/nomicon/send-and-sync.html Regardless of whether you use unsafe or not, thread safety is tracked with these and they allow the compiler to detect and prohibit data races.