tb := t.current.Load()
	var logf func(format string, args ...any)
	if tb != nil {
		tbb := *tb
		tbb.Helper()
		switch t.action.Load() {
		case errorMessage:
			logf = tbb.Errorf
		case fatalMessage:
			logf = tbb.Fatalf
		default:
			logf = tbb.Logf
		}
	} else {
		switch t.action.Load() {
		case errorMessage:
			logf = func(format string, args ...any) {

		buf := new(bytes.Buffer)

		t.Logf("input = %q", in)
		for _, tt := range []Reader{
			{Comma: ','},
			{Comma: ';'},
			{Comma: '\t'},
			{Comma: ',', LazyQuotes: true},
			{Comma: ',', TrimLeadingSpace: true},
			{Comma: ',', Comment: '#'},
			{Comma: ',', Comment: ';'},
		} {
			t.Logf("With options:")
			t.Logf("  Comma            = %q", tt.Comma)
			t.Logf("  LazyQuotes       = %t", tt.LazyQuotes)

		b.Logf("LOG: Y running N=%d", b.N)
	})
}
-- z_test.go --
package x

import "testing"

func TestZ(t *testing.T) {
	t.Logf("LOG: Z running")
}

func TestXX(t *testing.T) {
	t.Logf("LOG: XX running")
}

func BenchmarkZ(b *testing.B) {
	b.Logf("LOG: Z running N=%d", b.N)
}

func BenchmarkXX(b *testing.B) {
	b.Logf("LOG: XX running N=%d", b.N)

		}
		if len(allMismatches) == 0 {
			t.Logf("no diff found")
			return
		}
		sort.Slice(allMismatches, func(i, j int) bool {
			return len(allMismatches[i]) < len(allMismatches[j])
		})
		t.Logf("query %q returned %v series, but none matched our query exactly.", query.Metric, len(value))
		t.Logf("Original query: %v", query.String())
		for i, m := range allMismatches {

	}
	bdir2 := mkdir(t, filepath.Join(dir, "build2"))
	hargs2 := []string{"-coverpkg=all", "-covermode=" + nonAtomicMode}
	nonAtomicHarnessPath := buildHarness(t, bdir2, hargs2)

	t.Logf("atomic harness path is %s", atomicHarnessPath)
	t.Logf("non-atomic harness path is %s", nonAtomicHarnessPath)

	// Sub-tests for each API we want to inspect, plus
	// extras for error testing.
	t.Run("emitToDir", func(t *testing.T) {
		t.Parallel()

				}
			}
		}

		t.Logf("%s -o %s %s", cc, cexe, cfn)
		cmd = testenv.Command(t, cc, "-o", cexe, cfn)
		cmd = testenv.CleanCmdEnv(cmd)
		out, err = cmd.CombinedOutput()
		if len(out) > 0 {
			t.Logf("%s", out)
		}
		if err != nil {
			t.Skipf("can't verify VDSO status, C compiled failed: %v", err)
		}

		t.Logf("%s -f -e clock_gettime %s", strace, cexe)

		}
		if x != Y {
			logf("Bswap64(0x%08x) expected 0x%08x but got 0x%08x\n", y, x, Y)
		}

		x32 := uint32(X)
		y32 := uint32(Y >> 32)

		X32 := T.Bswap32(x32) // ERROR "intrinsic substitution for Bswap32"
		Y32 := T.Bswap32(y32) // ERROR "intrinsic substitution for Bswap32"
		if y32 != X32 {
			logf("Bswap32(0x%08x) expected 0x%08x but got 0x%08x\n", x32, y32, X32)
		}
		if x32 != Y32 {

	// Fatal is equivalent to Log() followed by FailNow(). 
	func (c *B) Fatal(args ...any)

	// Fatalf is equivalent to Logf() followed by FailNow(). 
	func (c *B) Fatalf(format string, args ...any)

	// Log formats its arguments using default formatting, analogous ...
	func (c *B) Log(args ...any)

	// Logf formats its arguments according to the format, analogous ...
	func (c *B) Logf(format string, args ...any)

			t.Errorf("index %v is an empty Statfs_t struct", i)
		}
	}
	if t.Failed() {
		for i, stat := range data[:n2] {
			t.Logf("data[%v] = %+v", i, stat)
		}
		mount, err := exec.Command("mount").CombinedOutput()
		if err != nil {
			t.Logf("mount: %v\n%s", err, mount)
		} else {
			t.Logf("mount: %s", mount)
		}
	}

	defer remove()

	path := filepath.Join(dir, "lock")

	mu := lockedfile.MutexAt(path)
	t.Logf("mu := MutexAt(_)")

	unlock, err := mu.Lock()
	if err != nil {
		t.Fatalf("mu.Lock: %v", err)
	}
	t.Logf("unlock, _  := mu.Lock()")

	mu2 := lockedfile.MutexAt(mu.Path)
	t.Logf("mu2 := MutexAt(mu.Path)")

	wait := mustBlock(t, "mu2.Lock()", func() {
		unlock2, err := mu2.Lock()
		if err != nil {