[GOOS:plan9] env userconfig=$home/lib

go telemetry
stdout 'local'

go telemetry off
go telemetry
stdout 'off'
go env GOTELEMETRY
stdout 'off'

go telemetry local
go telemetry
stdout 'local'
go env GOTELEMETRY
stdout 'local'

go telemetry on
go telemetry
stdout 'on'
go env GOTELEMETRY
stdout 'on'

go env
stdout 'GOTELEMETRY=''?on''?'
stdout 'GOTELEMETRYDIR=''?'$userconfig'[\\/]go[\\/]telemetry''?'

stdout go1.400

# GOTOOLCHAIN=version+auto sets a minimum.
env GOTOOLCHAIN=go1.600+auto
go version
stdout go1.600

env GOTOOLCHAIN=go1.400.0+auto
go version
stdout go1.400.0

# GOTOOLCHAIN=version+path sets a minimum too.
env GOTOOLCHAIN=go1.600+path
go version
stdout go1.600

env GOTOOLCHAIN=go1.400+path
go version
stdout go1.400

# Create a go.mod file and test interactions with auto and path.

! go list ./noread
! stdout '^example.com/noread$'
! stderr 'matched no packages'

! go list example.com/noread
! stdout '^example.com/noread$'
! stderr 'matched no packages'

# Check filesystem-relative patterns.

! go list ./...
! stdout '^example.com/noread$'
! stderr 'matched no packages'
stderr '^pattern ./...: '

! go list ./noread/...
! stdout '^example.com/noread$'

env home=$HOME/plan9home
go env GOENV
[GOOS:aix] stdout $HOME/.config/go/env
[GOOS:darwin] stdout $HOME'/Library/Application Support/go/env'
[GOOS:freebsd] stdout $HOME/.config/go/env
[GOOS:linux] stdout $HOME/.config/go/env
[GOOS:netbsd] stdout $HOME/.config/go/env
[GOOS:openbsd] stdout $HOME/.config/go/env
[GOOS:plan9] stdout $HOME/plan9home/lib/go/env
[GOOS:windows] stdout $HOME\\windowsappdata\\go\\env

	ok = true

	var eg InternalExample

	stdout, stderr := os.Stdout, os.Stderr
	defer func() {
		os.Stdout, os.Stderr = stdout, stderr
		if e := recover(); e != nil {
			fmt.Printf("--- FAIL: %s\npanic: %v\n", eg.Name, e)
			os.Exit(1)
		}
	}()

	for _, eg = range examples {
		if *chatty {
			fmt.Printf("=== RUN: %s\n", eg.Name)
		}

		// capture stdout and stderr
		r, w, err := os.Pipe()
		if err != nil {

! stdout panicnil
stdout randautoseed=0

# Go 1.21 work module should NOT set panicnil=1 in Go 1.20 dependency.
cp go.mod.21 go.mod
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' q
! stdout panicnil=1
! stdout randautoseed

go mod download rsc.io/panicnil # for go.sum
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' rsc.io/panicnil
! stdout panicnil=1
! stdout randautoseed

            this.stdErr = stdErr;
        }
    }

    private static class IndexBuilder {
        final Region stdOut = new Region();
        final Region stdErr = new Region();

        private final ImmutableMap.Builder<Long, Index> children = ImmutableMap.builder();

        void add(long key, Index index) {
            if (stdOut.start < 0) {
                stdOut.start = index.stdOut.start;

go list -mod=mod -m -f '{{.Path}} {{.Main}} {{.GoMod}} {{.Dir}}' all
stdout '^x true .*[\\/]src[\\/]go.mod .*[\\/]src$'
stdout '^rsc.io/quote false .*[\\/]v1.5.2.mod $'

# list {{.Dir}} shows dependency after download (and go list without -m downloads it)
go list -mod=mod -f '{{.Dir}}' rsc.io/quote
stdout '.*mod[\\/]rsc.io[\\/]quote@v1.5.2$'

# downloaded dependencies are read-only

go test -json ./pass
stdout '"Action":"pass","Package":"[^"]*","Elapsed":[^"]*}\n\z'
! stdout '"Test":.*\n\z'

# 'go test -json' should say a test passes if it exits 0 and prints nothing.
# TODO(golang.org/issue/29062): this should fail in the future.
go test -json ./exit0main
stdout '"Action":"pass".*\n\z'
! stdout '"Test":.*\n\z'

	externalCommand := exec.Command(cmd, args...)
	stdout := &bytes.Buffer{}
	stderr := &bytes.Buffer{}
	externalCommand.Stdout = stdout
	externalCommand.Stderr = stderr

	err := externalCommand.Run()

	if len(stdout.String()) != 0 {
		log.Debugf("Command output: \n%v", stdout.String())
	}

	if err != nil || len(stderr.Bytes()) != 0 {