Surely there is a way to present some piece of buggy code to a candidate and ask what’s wrong with it (letting them use whatever tools they want, doing this on

Surely there is a way to present some piece of buggy code to a candidate and ask what’s wrong with it (letting them use whatever tools they want, doing this on a whiteboard is senseless), let them determine what the bug is and see how they fix it. Obviously there are constraints that make the code in question difficult to construct (needs to be simple and small enough to fit in an interview without the candidate having ever seen the code before, but not too simple to make it a non-differentiating question; the bug has to have multiple levels to it where there’s an obvious fix and possibly several better but less obvious ways to fix the issue, etc)