I'm one of those annoying people who won't shut up about NixOS and thinks the LLMs are a bit of a fad, but chatGPT4 blew me away recently when debugging build issues with Nix derivations.
Whatever combination of the nixlanguage being obscure but also concise, but also, one of the largest github repos seems to have left ChatGPT with a fantastic understanding of the language.
Often you can just paste the error message in unprompted and it will guide you on your way, suggesting missing package names or bad assumptions.