Warning/error if procedure with return value doesn't contain exit() and doesn't assign to the named return value

[jhoek]

In procedures with a return value type (=functions), the developer should probably either call exit() to return a value, or assign to the named return value (if applicable) before the function execution ends. I would consider it a best practice not to "silently" exit the procedure without explicitly setting the return value on all code paths.

Perhaps this rule should be Hidden or Info by default, in order not to break anybody's workflow, in particularly people who don't consider the above a best practice?

Thanks again for considering my suggestion.