How does Nim ARC/ORC compare to Rust?

[RainbowAsteroids]

When learning Rust, I found it neat that, through the borrow checker and 
ownership principles, it created a sort of compile time garbage collector, 
ensuring safety w/o the runtime costs of a traditional garbage collector. I've 
also heard about Nim getting a new form of memory management called ARC, and I 
was wondering how it compares to Rust's memory management.