[steveklabnik]

You don't always need those; it depends on what you're doing. And furthermore, that _is_ the compile time system that enforces things. Go's race detector can only prove the presence of things, not their absense.

As for Pony,

> Pony-ORCA, yes the killer whale, is based on ideas from ownership and deferred, distributed, weighted reference counting.

That's it's GC.