Why `Option<&T>` will cause "temporary value dropped while borrowed"?

[RustyYato]

You may be interested in this blog which expands on the idea that references are locks.

Blog post: Rust, a unique perspective

Rust: A unique perspective is my attempt to explain Rust's memory safety guarantees in terms of unique versus shared access to memory. These aren't new ideas, but I couldn't find much existing documentation that introduces them to beginning and intermediate Rust programmers, so I wrote my own.