Solutions like this depend on the will, skill and ethics of the coder. Better IMHO to design a language in such a way that dangerous errors like this are compl

Solutions like this depend on the will, skill and ethics of the coder. Better IMHO to design a language in such a way that dangerous errors like this are completely impossible. (I mean... this is basically why I switched from Ruby to Elixir for web dev, eliminating an entire class of bugs... If the language itself doesn't provide an error-reduction feature, then you are reliant on other developers to "do the right thing" and lose any guarantees)