It's fairly up front in this portion of "the book," which is the standard learning material for new Rust programmers: https://doc.rust-lang.org/book/ch15-06-ref

It's fairly up front in this portion of "the book," which is the standard learning material for new Rust programmers: https://doc.rust-lang.org/book/ch15-06-reference-cycles.html https://doc.rust-lang.org/book/ch15-06-reference-cycles.html