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      BTW, for the such and similar situations go-critic has checks rangeValCopy and rangeExprCopy

      See docs: https://go-critic.github.io/overview

      Repo: https://github.com/go-critic/go-critic

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        Thanks, I integrated it into my codebase. The default sizeLimit of 512 seems rather large, I would expect to see something like 64.


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          go-critic has a support for config per checker, look for @rangeExprCopy.sizeThreshold on the overview page :)

          And from what I see there is no mention of go-critic config param (oops), we’ll update docs soon.

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            Yeah, I dug thru it and config’d golangci-lint. See link above.

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          Just in case if you didn’t know: you can change the default size with -@rangeExprCopy.sizeThreshold parameter.

          To get a list of checkers, run: gocritic doc.

          To get info about a checker, run: gocritic doc <checkerName>.

          So, in case of the rangeExprCopy you do “gocritic doc rangeExprCopy” and it tells what parameters are available.

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      I think this is somewhat standard behavior. In other programming languages, the compiler, or latest, the runtime might try to prevent modifications to a looped-over collection. Go would allow that when using a pointer. Makes sense from a semantic point of view. Treat the ranged-over slice as immutable, unless you use a pointer to it.