unused: struct comparison

[s1na]

Hello. I'm using unused via golangci-lint. Here is the version of the packages:

❯ golangci-lint --version
golangci-lint has version 1.59.1 built with go1.22.4 from 1a55854 on 2024-06-08T22:05:49Z

❯ go version
go version go1.22.5 darwin/amd64

I can see that the version of go-tools that golanci-lint is using is honnef.co/go/tools v0.4.7.

go env

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/Users/sina/Library/Caches/go-build'
GOENV='/Users/sina/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/sina/dev/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/sina/dev/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/Cellar/go/1.22.5/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/Cellar/go/1.22.5/libexec/pkg/tool/darwin_amd64'
GOVCS=''
GOVERSION='go1.22.5'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/sina/dev/go/src/github.com/s1na/test-unused-ci/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/cp/k3x0xm3959qf9l0pcbbdxdt80000gn/T/go-build4190770178=/tmp/go-build -gno-record-gcc-switches -fno-common'

I'm running this command:

golangci-lint run

My config is:

linters:
  disable-all: true
  enable:
    - unused

linters-settings:
  unused:
    field-writes-are-uses: false
    generated-is-used: true

This is the code:

package main

import "fmt"

type A struct {
	foo  bool
	bar  bool
	used string
}

func main() {
	a := A{foo: true, bar: true, used: "hi"}
	b := A{foo: true, bar: true, used: "hi"}
	fmt.Printf("%s %s %v\n", a.used, b.used, a == b)
}

unused thinks foo and bar are unused in this case. Their values are read by the struct comparison.