Go 1.22 code simplification

[Amnon]

Go 1.22 contains some cool features which will allow us to write simpler code.

Would it be possible for gofmt -s to help us do transformations which clean up old code such as 
for i := 0; i < n; i++   -> for i := range n
removing x := x assignments inside range loops
or updating code to use the new math/rand/v2 API?

If not, has anyone written any refactoring tools to do this?

[David Finkel]

I don't know of anything that does those rewrites (and haven't looked), but it looks like gofmt -s could support it by extending this type-switch: https://cs.opensource.google/go/go/+/master:src/cmd/gofmt/simplify.go;l=16-103;drc=9b89c380208ea2e85985ee6bf2b1d684274dfa1d

I like the idea of an automatic rewrite of those loop primitives, though.

(it's possible that the x := x case may need type/declaration-location information that gofmt doesn't have to do robustly, though)

Note: the go fix directory hasn't had any commits since August, so it doesn't appear to have it either. (that might be the right place for that rewrite -- although, I think vet also has a suggested fix capacity that would make sense for any module with the go line set to 1.22+)

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