In my experience, a LLM decided to not know type alignment rules in C and confidently trotted out the wrong answer. It left a horrible taste in my mouth for the one time I decided to look at using a LLM for anything and it keeps leaving me wondering if I'd end up more time bashing the LLM into working than just working out the answer myself and learning the underlying reasoning why.

It was so wrong that I wonder what version of the C standard it was even hallucinating.