[remram]

Python's with keyword maybe?

You can do

    with lock:
       # lock is held
    # lock released
    with lock:
       # lock is held again

Also Go's defer keyword, which is bound to the current function (defer until function returns).

[jolux]

Right, but those are opt-in features. In Python you can lock something and not release it by mistake. In Rust this pattern is enforced, the destructor will always release it at the end of the enclosing scope unless there is a panic or infinite loop. I think this is a substantive difference.

[tazjin]

It's not enforced in Rust, but it's automatic unless you actively prevent it from happening. So you could say it's an opt-out feature.

std::mem::forget is considered safe, as explained in its docs: https://doc.rust-lang.org/std/mem/fn.forget.html

[jolux]

Fair enough, yeah.