// information to accurately correlate with the stderr output.
				} else {
					t.Parallel()
				}
			} else {
				old := *goVersion
				*goVersion = tt.Version
				defer func() {
					*goVersion = old
				}()
			}

			// Apply fix: should get tt.Out.
			out, fixed, ok := parseFixPrint(t, tt.Fn, tt.Name, tt.In, true)
			if !ok {
				return
			}

// See the License for the specific language governing permissions and
// limitations under the License.

package k8sversion

import (
	"fmt"

	goversion "github.com/hashicorp/go-version"
	"k8s.io/apimachinery/pkg/version"

	"istio.io/istio/operator/pkg/util/clog"
	"istio.io/istio/pkg/kube"
	pkgVersion "istio.io/istio/pkg/version"
)

const (

cmpenv go.work $WORK/go.work.want

-- go.mod --
module example
go 1.18
-- dir/go.mod --
module example
go 1.18
-- dir/foo/bar/go.mod --
module example
go 1.18
-- $WORK/go.work.want --
go $goversion

use (
	.
	..
	./foo/bar

var buildtagFix = fix{
	name: "buildtag",
	date: "2021-08-25",
	f:    buildtag,
	desc: `Remove +build comments from modules using Go 1.18 or later`,
}

func buildtag(f *ast.File) bool {
	if version.Compare(*goVersion, buildtagGoVersionCutoff) < 0 {
		return false
	}

	// File is already gofmt-ed, so we know that if there are +build lines,
	// they are in a comment group that starts with a //go:build line followed

	// since at that time the go directive wasn't clearly
	// specified as a toolchain requirement.
	//
	// TODO(adonovan): after go1.21, call GoVersion directly.
	pkgVersion := any(pass.Pkg).(interface{ GoVersion() string }).GoVersion()
	if !versions.AtLeast(pkgVersion, "go1.21") {
		return nil, nil
	}

	// disallowedSymbols returns the set of standard library symbols

env GOWORK=$GOPATH/src/unformatted
go work edit -print -fmt
cmp stdout $GOPATH/src/formatted

-- m/go.mod --
module m

go 1.18
-- go.work.want_initial --
go $goversion

use ./m
-- go.work.want_use_n --
go $goversion

use (
	./m
	./n
)
-- go.work.want_go_118 --
go 1.18

use (
	./m
	./n
)
-- go.work.want_dropuse_m --
go 1.18

use ./n

// version of the form "v1.2.3". Go versions may also include spaces and
// special characters.
func ProgramInfo(info *debug.BuildInfo) (goVers, progPath, progVers string) {
	goVers = info.GoVersion
	if strings.Contains(goVers, "devel") || strings.Contains(goVers, "-") {
		goVers = "devel"
	}

	progPath = info.Path
	if progPath == "" {
		progPath = strings.TrimSuffix(filepath.Base(os.Args[0]), ".exe")
	}

! stderr .+

# go env -w rejects unknown or bad variables
! go env -w GOGC=off
stderr 'unknown go command variable GOGC'
! go env -w GOEXE=.bat
stderr 'GOEXE cannot be modified'
! go env -w GOVERSION=customversion
stderr 'GOVERSION cannot be modified'
! go env -w GOENV=/env
stderr 'GOENV can only be set using the OS environment'
! go env -w GODEBUG=gctrace=1
stderr 'GODEBUG can only be set using the OS environment'

	Dir        string           `json:",omitempty"` // directory holding local copy of files, if any
	GoMod      string           `json:",omitempty"` // path to go.mod file describing module, if any
	GoVersion  string           `json:",omitempty"` // go version used in module
	Retracted  []string         `json:",omitempty"` // retraction information, if any (with -retracted or -u)

        GOPROXY="https://proxy.golang.org,direct"
        GOROOT="/usr/local/go"
        GOSUMDB="sum.golang.org"
        GOTMPDIR=""
        GOTOOLDIR="/usr/local/go/pkg/tool/darwin_arm64"
        GOVCS=""
        GOVERSION="go1.20.7"
        GCCGO="gccgo"
        AR="ar"
        CC="clang"
        CXX="clang++"
        CGO_ENABLED="1"
        GOMOD="/dev/null"
        GOWORK=""
        CGO_CFLAGS="-O2 -g"