Isn’t this just like a type system? I suspect that other languages seem even better as subjects for this kind of formal verification. Haskell and Rust come to

Isn’t this just like a type system? I suspect that other languages seem even better as subjects for this kind of formal verification. Haskell and Rust come to mind. For the same reasons, Go and Smalltalk strike me as less suitable. (For those people who think I'm just a Go and Smalltalk partisan.)