Can you give an example? I have yet to run into a language that doesn't require a proof of correctness, but will just attempt to find a counterexample.
Again: I am looking for a language that doesn't require you to provide a proof. I'm looking for a language that is a "logical extension" of what currently is available - that is, I am looking for a language that will attempt to find a counterexample on compilation and will bail if it can.
Any working program will in some sense be a proof, by Curry-Howard. So I think asking to not have to provide a proof is backwards; what you want is a language that makes it easy to express the program and manipulate it as a proof.