Comment by jerf

Are you thinking of some sort of annotation the compiler could read and handle?

Because if a compiler starts automatically padding all my structures to put all of the members on their own cache line I'm going to be quite peeved. It would be easy for it to do, yes, but it would be wrong 99%+ of the time.

A far more trenchant complaint is that Go won't automatically sort struct members if necessary to shrink them and you have to apply a linter to get that at linting time if you want it.