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There is a commit that just didn't work, so I want to abandon it without deleting it from history.
I have updated from an earlier revision and committed, thus creating a new head.
I don't have branches, I don't want branches, I just want to simply go on with the new head exactly as it is, nothing fancy, no merge, no worries, just go on forgetting the previous one.
I can't seem to find how to do that, and I'm starting to believe it can't be done. All I find is stuff about branches, or stuff about merging.