What is `std::pin::Pin` in Rust?
Summary
The article provides a thorough explanation of Rust's Pin and the pinning concept, outlining why pinning matters for self-referential types and async futures, how Pin enforces non-movement of the pointee, and common constructors like Pin::new, pin!, Box::pin, and Pin::new_unchecked. It also covers Unpin and practical scenarios where pinning is relevant in Rust code, with code examples to illustrate the concepts.