Sure, dropping down to a C interface is easy enough, but far from ideal. So much of Rust's expressive power is lost by doing so. What would be the downside of

Sure, dropping down to a C interface is easy enough, but far from ideal. So much of Rust's expressive power is lost by doing so. What would be the downside of providing a stable ABI for an edition? It seems to me it resolves both sides of the argument on stable ABIs. By the way, I'm mostly thinking about Rust -> Rust dynamic linking.