Comment by pjmlp

While RC is a GC algorithm, chapter 5 from GC handbook, it doesn't count when it isn't part of the type system because then it becomes optional and not part of the regular use of the programming language.

Additionally Limbo's GC is a bit more complicaticated than a plain add_ref()/release() pair of library calls.

https://doc.cat-v.org/inferno/concurrent_gc/concurrent_gc.pd...