func TestStackCheckOutput(t *testing.T) {
	testenv.MustHaveGoBuild(t)
	t.Parallel()

	cmd := testenv.Command(t, testenv.GoToolPath(t), "build", "-o", os.DevNull, "./testdata/stackcheck")
	// The rules for computing frame sizes on all of the
	// architectures are complicated, so just do this on amd64.
	cmd.Env = append(os.Environ(), "GOARCH=amd64", "GOOS=linux")

	"os"
	"syscall"
	"testing"
	"time"
)

func TestUnixConnReadMsgUnixSCMRightsCloseOnExec(t *testing.T) {
	if !testableNetwork("unix") {
		t.Skip("not unix system")
	}

	scmFile, err := os.Open(os.DevNull)
	if err != nil {
		t.Fatalf("file open: %v", err)
	}
	defer scmFile.Close()

	rights := syscall.UnixRights(int(scmFile.Fd()))
	fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM, 0)

		ctx, cancel := context.WithCancel(req.Context())
		defer cancel()

		cmd := exec.CommandContext(ctx, h.hgPath, "serve", "--port", "0", "--address", "localhost", "--accesslog", os.DevNull, "--name", "vcweb", "--print-url")
		cmd.Dir = dir
		cmd.Env = append(slices.Clip(env), "PWD="+dir)

		cmd.Cancel = func() error {
			err := cmd.Process.Signal(os.Interrupt)

	GOROOT=<actual GOROOT>
	TESTGO_GOROOT=<GOROOT used to build cmd/go, for use in tests that may change GOROOT>
	HOME=/no-home
	PATH=<actual PATH>
	TMPDIR=$WORK/tmp
	GODEBUG=<actual GODEBUG>
	devnull=<value of os.DevNull>
	goversion=<current Go version; for example, 1.12>

On Plan 9, the variables $path and $home are set instead of $PATH and $HOME.
On Windows, the variables $USERPROFILE and $TMP are set instead of

# 'go mod init' should succeed if modules are not explicitly disabled.
cd $GOPATH/src/example.com/x/y
go mod init
stderr 'module example.com/x/y$'
rm go.mod

# go mod init rejects a zero-length go.mod file
cp $devnull go.mod # can't use touch to create it because Windows
! go mod init
stderr 'go.mod already exists'

# Module path from Godeps/Godeps.json overrides GOPATH.
cd $GOPATH/src/example.com/x/y/z
go mod init

	adminAPIVersionPrefix          = SlashSeparator + adminAPIVersion
	adminAPISiteReplicationDevNull = "/site-replication/devnull"
	adminAPISiteReplicationNetPerf = "/site-replication/netperf"
	adminAPIClientDevNull          = "/speedtest/client/devnull"
	adminAPIClientDevExtraTime     = "/speedtest/client/devnull/extratime"
)

var gzipHandler = func() func(http.Handler) http.HandlerFunc {

	if h == syscall.InvalidHandle {
		return nil
	}
	return newFile(h, name, "file")
}

func epipecheck(file *File, e error) {
}

// DevNull is the name of the operating system's “null device.”
// On Unix-like systems, it is "/dev/null"; on Windows, "NUL".
const DevNull = "NUL"

// openFileNolog is the Windows implementation of OpenFile.
func openFileNolog(name string, flag int, perm FileMode) (*File, error) {

		"TESTGO_VCSTEST_CERT=" + srvCertFile,
		"TESTGONETWORK=panic", // cleared by the [net] condition
		"GOSUMDB=" + testSumDBVerifierKey,
		"GONOPROXY=",
		"GONOSUMDB=",
		"GOVCS=*:all",
		"devnull=" + os.DevNull,
		"goversion=" + gover.Local(),
		"CMDGO_TEST_RUN_MAIN=true",
		"HGRCPATH=",
		"GOTOOLCHAIN=auto",
		"newline=\n",
	}

	if testenv.Builder() != "" || os.Getenv("GIT_TRACE_CURL") == "1" {

// issue 11845.
func epipecheck(file *File, e error) {
	if e == syscall.EPIPE && file.stdoutOrErr {
		sigpipe()
	}
}

// DevNull is the name of the operating system's “null device.”
// On Unix-like systems, it is "/dev/null"; on Windows, "NUL".
const DevNull = "/dev/null"

// openFileNolog is the Unix implementation of OpenFile.
// Changes here should be reflected in openDirAt and openDirNolog, if relevant.

	GOROOT=<actual GOROOT>
	TESTGO_GOROOT=<GOROOT used to build cmd/go, for use in tests that may change GOROOT>
	HOME=/no-home
	PATH=<actual PATH>
	TMPDIR=$WORK/tmp
	GODEBUG=<actual GODEBUG>
	devnull=<value of os.DevNull>
	goversion=<current Go version; for example, 1.12>

On Plan 9, the variables $path and $home are set instead of $PATH and $HOME.
On Windows, the variables $USERPROFILE and $TMP are set instead of