if sel.Indirect() {
			direct = "->"
		}
		got := [2]string{
			sel.String(),
			fmt.Sprintf("%s%v", direct, sel.Index()),
		}
		want := wantOut[syntax]
		if want != got {
			t.Errorf("%s: got %q; want %q", syntax, got, want)
		}
		delete(wantOut, syntax)

		// We must explicitly assert properties of the
		// Signature's receiver since it doesn't participate
		// in Identical() or String().

		if sel.Indirect() {
			direct = "->"
		}
		got := [2]string{
			sel.String(),
			fmt.Sprintf("%s%v", direct, sel.Index()),
		}
		want := wantOut[segment]
		if want != got {
			t.Errorf("%s: got %q; want %q", segment, got, want)
		}
		delete(wantOut, segment)

		// We must explicitly assert properties of the
		// Signature's receiver since it doesn't participate
		// in Identical() or String().

// It consists of pairs: full path to source file and its base name.
func (t test) errorCheck(outStr string, wantAuto bool, fullshort ...string) (err error) {
	defer func() {
		if testing.Verbose() && err != nil {
			t.Logf("gc output:\n%s", outStr)
		}
	}()
	var errs []error
	out := splitOutput(outStr, wantAuto)

	// Cut directory name.
	for i := range out {
		for j := 0; j < len(fullshort); j += 2 {

	}
}

func TestInvalidUserPassword(t *testing.T) {
	_, err := Parse("http://user^:passwo^******@****.***/")
	if got, wantsub := fmt.Sprint(err), "net/url: invalid userinfo"; !strings.Contains(got, wantsub) {
		t.Errorf("error = %q; want substring %q", got, wantsub)
	}
}

func TestRejectControlCharacters(t *testing.T) {
	tests := []string{
		"http://foo.com/?foo\nbar",
		"http\r://foo.com/",

	io.WriteString(f, data)

	f.Seek(0, 0)
	b := make([]byte, 5)

	n, err := f.ReadAt(b, -10)

	const wantsub = "negative offset"
	if !strings.Contains(fmt.Sprint(err), wantsub) || n != 0 {
		t.Errorf("ReadAt(-10) = %v, %v; want 0, ...%q...", n, err, wantsub)
	}
}

func TestWriteAt(t *testing.T) {
	t.Parallel()

	f := newFile("TestWriteAt", t)
	defer Remove(f.Name())

		F1 string `json:"F1,string"`
	}
	wantT := T{"aaa\tbbb"}

	b, err := Marshal(wantT)
	if err != nil {
		t.Fatalf("Marshal error: %v", err)
	}
	var gotT T
	if err := Unmarshal(b, &gotT); err != nil {
		t.Fatalf("Unmarshal error: %v", err)
	}
	if gotT != wantT {
		t.Errorf("Marshal/Unmarshal roundtrip:\n\tgot:  %q\n\twant: %q", gotT, wantT)
	}

	// See golang.org/issues/39555.