[tools] go/analysis/passes/modernize: moderniser for iterator APIs

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Gopher Robot (Gerrit)

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Oct 7, 2025, 5:22:24 PM (15 hours ago) Oct 7

to Alan Donovan, goph...@pubsubhelper.golang.org, golang-...@googlegroups.com, Go LUCI, Robert Findley, Mateusz Poliwczak, Austin Clements, golang-co...@googlegroups.com

Gopher Robot submitted the change

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Change information

Commit message:

go/analysis/passes/modernize: modernizer for iterator APIs

This CL adds the stditerators modernizer, which replaces loops
of the form

  for i := 0; i < x.Len(); i++ {
      use(x.At(i))
  }

or their "range x.Len()" equivalent by

  for elem := range x.All() {
      use(x.At(i)
  }

for various well-known std types.

Publishing each new Analyzer symbol requires going through the
proposal process, so we plan to do them in one batch per Go
release. In the interim, we cannot make such symbols public,
so we use a backdoor mechanism to export them to gopls.

+ test, doc, relnote

Updates golang/go#75693