Pretty much anything for which you'd need intelligence of any kind. Questions such as: Do these two paragraphs have the same semantic meaning? Do they have the same sentiment? Do these two methods have the same contract? etc. Not all documents our code and even with code deterministic tools gets you only so far.

A model can 'analyze' the intent of a patch, 'understand' it, and then correctly merge it in a derived codebase, going further than merely resolving conflicts.

I sometimes find myself with thousands of log lines from a problematic execution and a known good reference, wondering nonspecifically if "something weird" happened in the first one. I don't think there's any matching-based solution there; you need a scan process that understands variations in execution time, object identifiers, etc. aren't meaningful.