How are Rust's Arc and Rc types different from having garbage collection?

Question

The Rust Programming Language, first edition says that Rust does not have a garbage collector:

It maintains these goals without having a garbage colle

Answer 1

If you insist on being correct, a garbage collector collects. It collects a list of memory locations to free. Rc/Arc on the other hand does not, so I don't think you can call it garbage collection.

However rust has the std::gc module, so yea rust has in fact an optional garbage collector for now.