golangci-lintが、 v1.45.0 (投稿時点の最新版)でGo1.18の新構文（ジェネリクスやany等）に対応しました 
これで心おきなくジェネリクスが使えます！
早速 issueでの紹介手順 に従ってリンターをかけてみました。
（現在進行形で対応が進んでいるので、最新の状況については この記事より issueでの確認をおすすめします）
準備
.golangci.yml に以下の2行を足すだけです。
.golangci.yml
run:
go: 1.18
（ちなみに指定しない場合Go1.17までのモードで起動しクラッシュしました）
$ golangci-lint run
ERRO [runner] Panic: unused: package "main" (isInitialPkg: true, needAnalyzeSource: true): T: goroutine 747 ...
WARN [runner] Can't run linter goanalysis_metalinter: goanalysis_metalinter: unused: package "main" (isInitialPkg: true, needAnalyzeSource: true): T
ERRO Running error: 1 error occurred:
* can't run linter goanalysis_metalinter: goanalysis_metalinter: unused: package "main" (isInitialPkg: true, needAnalyzeSource: true): T
使ってみる
以下の新構文を入れたサンプルコードにリンターをかけます。
- ジェネリック関数
anycomparable
main.go
package main
import "fmt"
func myGenerics[T comparable](a, b T) bool {
return a == b
}
func main() {
var _ any
fmt.Println(myGenerics("foo", "bar"))
}
リンターはすべて有効化します。
.golangci.yml
run:
go: 1.18
linters:
enable-all: true
実行成功しました。forbidigo に怒られていますが、Println を使っているので想定通りです。
$ golangci-lint run
WARN [runner] The linter 'interfacer' is deprecated (since v1.38.0) due to: The repository of the linter has been archived by the owner.
WARN [runner] The linter 'maligned' is deprecated (since v1.38.0) due to: The repository of the linter has been archived by the owner. Replaced by govet 'fieldalignment'.
WARN [runner] The linter 'golint' is deprecated (since v1.41.0) due to: The repository of the linter has been archived by the owner. Replaced by revive.
WARN [runner] The linter 'scopelint' is deprecated (since v1.39.0) due to: The repository of the linter has been deprecated by the owner. Replaced by exportloopref.
WARN [linters context] bodyclose is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] contextcheck is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] gosimple is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] nilerr is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] noctx is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] rowserrcheck is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] sqlclosecheck is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] staticcheck is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] stylecheck is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] tparallel is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] unparam is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] wastedassign is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
WARN [linters context] unused is disabled because of go1.18. If you are not using go1.18, you can set `go: go1.17` in the `run` section. You can track the evolution of the go1.18 support by following the https://github.com/golangci/golangci-lint/issues/2649.
main.go:11:2: use of `fmt.Println` forbidden by pattern `^(fmt\.Print(|f|ln)|print|println)$` (forbidigo)
fmt.Println(myGenerics("foo", "bar"))
一部のリンターが無効化されているという警告がでていますが、これは静的単一代入(SSA)の検査がジェネリクス未対応なためのようです。
- 無効化されているリンター一覧
- 静的単一代入形式のジェネリクス対応issue
おわりに
Go1.18リリースから1週間足らず対応されていて、開発者の方々には本当に頭が上がりません。
これでジェネリクスを使わない理由が無くなったので、どんどん活用していこうと思います！