}

func coverTearDown(coverprofile string, gocoverdir string) (string, error) {
	var err error
	if gocoverdir == "" {
		gocoverdir, err = os.MkdirTemp("", "gocoverdir")
		if err != nil {
			return "error setting GOCOVERDIR: bad os.MkdirTemp return", err
		}
		defer os.RemoveAll(gocoverdir)
	}
	CoverMarkProfileEmittedFunc(true)
	cmode := CoverMode

	mode        string
	tearDown    func(coverprofile string, gocoverdir string) (string, error)
	snapshotcov func() float64
}

// registerCover2 is invoked during "go test -cover" runs.
// It is used to record a 'tear down' function
// (to be called when the test is complete) and the coverage mode.
func registerCover2(mode string, tearDown func(coverprofile string, gocoverdir string) (string, error), snapcov func() float64) {
	if mode == "" {

	"internal/goexperiment"
	"internal/testenv"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
	_ "unsafe"
)

func testGoCoverDir(t *testing.T) string {
	if f := flag.Lookup("test.gocoverdir"); f != nil {
		if dir := f.Value.String(); dir != "" {
			return dir
		}
	}
	return t.TempDir()
}

// TestTestSupport does a basic verification of the functionality in

# m/example package. Build IDs from binaries are of the form X/Y/Z/W
# where Y/Z is the package build ID; running the program below will
# pick out the parts of the ID that we want.
env GOCOVERDIR=$WORK
exec $WORK/m.exe $WORK/rawtoolbuildid.txt
cp stdout $WORK/toolbuildid.txt

# Build IDs should match here.
cmp $WORK/toolbuildid.txt $WORK/listbuildid.txt