[throw0u1t]

You're talking about the Drop trait?

I'm learning Rust coming from Go. It looks cool, but it also concerns me how most data structures in the stdlib use unsafe blocks to defeat the borrow checker. This is not the point of Rust, I would have thought?!

[steveklabnik]

One of the criteria for belonging in the standard library is “needs a lot of unsafe to implement”, so the standard library has more unsafe code than your average codebase.

Beyond that, to some degree, it is the point of Rust: limit unsafe things so that you can reason about them more easily. The CPU is inherently not safe, so it has to exist on some level. rust gives you tools to manage this.