I don't really think Go error handling is a good example. A nil test paired with a return cannot be extracted to a function. A macro could perhaps centralize the logic, but otherwise it's no more amenable to deduplication than plain addition. Moreover, it's completely trivial, if verbose in the Go language.

The case where it becomes interesting is when there are four or five statements that are repeated. If it's two statements, especially if the statements are both control flow, one of which is tied to the frame of the executing function, and the other is a trivial nil test, that falls firmly on the "not refactorable" side of the line.