> [You can] create a trivial concurrent [Go] program that violates the memory safety guarantees ... > That is not true of Rust.

It's not supposed to be, but Rust does have plenty of outstanding soundness bugs: https://github.com/rust-lang/rust/issues?q=state%3Aopen%20la...

Rust as intended is safe and sound unless you write u-n-s-a-f-e, but as implemented has a ways to go.