{&errorUncomparable{}, err1, false},
		{multiErr{}, err1, false},
		{multiErr{err1, err3}, err1, true},
		{multiErr{err3, err1}, err1, true},
		{multiErr{err1, err3}, errors.New("x"), false},
		{multiErr{err3, errb}, errb, true},
		{multiErr{err3, errb}, erra, true},
		{multiErr{err3, errb}, err1, true},
		{multiErr{errb, err3}, err1, true},
		{multiErr{poser}, err1, true},
		{multiErr{poser}, err3, true},

	for n, ct := range conversionTests() {
		err := convertAssign(ct.d, ct.s)
		errstr := ""
		if err != nil {
			errstr = err.Error()
		}
		errf := func(format string, args ...any) {
			base := fmt.Sprintf("convertAssign #%d: for %v (%T) -> %T, ", n, ct.s, ct.s, ct.d)
			t.Errorf(base+format, args...)
		}
		if errstr != ct.wanterr {
			errf("got error %q, want error %q", errstr, ct.wanterr)
		}

				if err != nil {
					return nil, err
				}
				cursor, err := (substmt.(driver.StmtQueryContext)).QueryContext(ctx, []driver.NamedValue{})
				substmt.Close()
				if err != nil {
					return nil, err
				}
				subsetVal = cursor
			default:
				stmt.Close()
				return nil, errf("unsupported conversion for pre-bound parameter %q to type %q", value, ctype)
			}

		failingDNSServer.Server.PacketConn.LocalAddr().String(),
		workingDNSServer.Server.PacketConn.LocalAddr().String(),
	}
	t.Cleanup(func() {
		errW := workingDNSServer.Shutdown()
		errF := failingDNSServer.Shutdown()
		if errW != nil || errF != nil {
			t.Logf("failed shutting down fake dns servers")
		}
	})

	meshNetworks := mesh.NewFixedNetworksWatcher(nil)
	xdsUpdater := xdsfake.NewFakeXDS()

	// override GOTRACEBACK=crash from the user.
	SetTracebackEnv("system")
}

var errf error

func errfn() error {
	return errf
}

func errfn1() error {
	return io.EOF
}

func BenchmarkIfaceCmp100(b *testing.B) {
	for i := 0; i < b.N; i++ {
		for j := 0; j < 100; j++ {
			if errfn() == io.EOF {
				b.Fatal("bad comparison")
			}
		}
	}
}

	q, err := d.Quantity.evalNode(r, tableAlias)
	if err != nil {
		return nil, err
	}
	inferTypeForArithOp(q)
	qty, ok := q.ToFloat()
	if !ok {
		return nil, fmt.Errorf("QUANTITY must be a numeric argument to %s()", sqlFnDateAdd)
	}

	ts, err := d.Timestamp.evalNode(r, tableAlias)
	if err != nil {
		return nil, err
	}
	if err = inferTypeAsTimestamp(ts); err != nil {
		return nil, err
	}

	if err1 != nil {
		t.Fatalf("NestedPendingOperations failed for operation1. Expected: <no error> Actual: <%v>", err1)
	}

	err2 := grm.Run(mainVolumeName, "" /* podName */, node2, volumetypes.GeneratedOperations{OperationFunc: operation2})
	if err2 != nil {
		t.Fatalf("NestedPendingOperations failed for operation2. Expected: <no error> Actual: <%v>", err2)
	}

	opZContinueCh <- true
	time.Sleep(delay)
	op2ContinueCh <- true

	operation := func() error { return nil }

	// Act
	err1 := grm.Run(operation1Name, operation)
	err2 := grm.Run(operation2Name, operation)

	// Assert
	if err1 != nil {
		t.Fatalf("NewGoRoutine %q failed. Expected: <no error> Actual: <%v>", operation1Name, err1)
	}

	if err2 != nil {
		t.Fatalf("NewGoRoutine %q failed. Expected: <no error> Actual: <%v>", operation2Name, err2)
	}
}

	dir, err := os.MkdirTemp("", filepath.Base(t.Name()))
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(dir)

	dst := filepath.Join(dir, strings.TrimSuffix(file, ".go"))
	cmd := exec.Command("go", "build", "-gcflags=-L -e", "-o="+dst, path(file)) // TODO(gri) no need for -gcflags=-L if go tool is adjusted
	out, err := cmd.CombinedOutput()
	if err == nil {

	}

	errs = AppendErr(errs, nil)
	if got, want := errs.String(), ""; got != want {
		t.Errorf("got: %s, want: %s", got, want)
	}

	errs = AppendErr(errs, fmt.Errorf("err1"))
	if got, want := errs.String(), "err1"; got != want {
		t.Errorf("got: %s, want: %s", got, want)
	}

	errs = AppendErr(errs, nil)
	errs = AppendErr(errs, fmt.Errorf("err2"))
	if got, want := errs.String(), "err1, err2"; got != want {