std: add struct field tags to untagged literals.

R=rsc, dsymonds, bsiegert, rogpeppe
CC=golang-dev
https://golang.org/cl/5619052

src/pkg/crypto/x509/pkcs1.go

@@ -40,7 +40,7 @@ func ParsePKCS1PrivateKey(der []byte) (key *rsa.PrivateKey, err error) {
 	var priv pkcs1PrivateKey
 	rest, err := asn1.Unmarshal(der, &priv)
 	if len(rest) > 0 {
-		err = asn1.SyntaxError{"trailing data"}
+		err = asn1.SyntaxError{Msg: "trailing data"}
 		return
 	}
 	if err != nil {

src/pkg/crypto/x509/x509.go

@@ -592,7 +592,7 @@ func parseCertificate(in *certificate) (*Certificate, error) {
 					return nil, err
 				}
 				if !seq.IsCompound || seq.Tag != 16 || seq.Class != 0 {
-					return nil, asn1.StructuralError{"bad SAN sequence"}
+					return nil, asn1.StructuralError{Msg: "bad SAN sequence"}
 				}
 
 				parsedName := false
@@ -744,7 +744,7 @@ func ParseCertificate(asn1Data []byte) (*Certificate, error) {
 		return nil, err
 	}
 	if len(rest) > 0 {
-		return nil, asn1.SyntaxError{"trailing data"}
+		return nil, asn1.SyntaxError{Msg: "trailing data"}
 	}
 
 	return parseCertificate(&cert)

src/pkg/database/sql/fakedb_test.go

@@ -586,25 +586,25 @@ func converterForType(typ string) driver.ValueConverter {
 	case "bool":
 		return driver.Bool
 	case "nullbool":
-		return driver.Null{driver.Bool}
+		return driver.Null{Converter: driver.Bool}
 	case "int32":
 		return driver.Int32
 	case "string":
-		return driver.NotNull{driver.String}
+		return driver.NotNull{Converter: driver.String}
 	case "nullstring":
-		return driver.Null{driver.String}
+		return driver.Null{Converter: driver.String}
 	case "int64":
 		// TODO(coopernurse): add type-specific converter
-		return driver.NotNull{driver.DefaultParameterConverter}
+		return driver.NotNull{Converter: driver.DefaultParameterConverter}
 	case "nullint64":
 		// TODO(coopernurse): add type-specific converter
-		return driver.Null{driver.DefaultParameterConverter}
+		return driver.Null{Converter: driver.DefaultParameterConverter}
 	case "float64":
 		// TODO(coopernurse): add type-specific converter
-		return driver.NotNull{driver.DefaultParameterConverter}
+		return driver.NotNull{Converter: driver.DefaultParameterConverter}
 	case "nullfloat64":
 		// TODO(coopernurse): add type-specific converter
-		return driver.Null{driver.DefaultParameterConverter}
+		return driver.Null{Converter: driver.DefaultParameterConverter}
 	case "datetime":
 		return driver.DefaultParameterConverter
 	}

src/pkg/exp/inotify/inotify_linux.go

@@ -107,7 +107,11 @@ func (w *Watcher) AddWatch(path string, flags uint32) error {
 	}
 	wd, err := syscall.InotifyAddWatch(w.fd, path, flags)
 	if err != nil {
-		return &os.PathError{"inotify_add_watch", path, err}
+		return &os.PathError{
+			Op:   "inotify_add_watch",
+			Path: path,
+			Err:  err,
+		}
 	}
 
 	if !found {

src/pkg/go/doc/example.go

@@ -33,8 +33,11 @@ func Examples(pkg *ast.Package) []*Example {
 				continue
 			}
 			examples = append(examples, &Example{
-				Name:   name[len("Example"):],
-				Body:   &printer.CommentedNode{f.Body, src.Comments},
+				Name: name[len("Example"):],
+				Body: &printer.CommentedNode{
+					Node:     f.Body,
+					Comments: src.Comments,
+				},
 				Output: f.Doc.Text(),
 			})
 		}

src/pkg/go/scanner/scanner_test.go

@@ -230,7 +230,13 @@ func TestScan(t *testing.T) {
 	var s Scanner
 	s.Init(fset.AddFile("", fset.Base(), len(source)), source, &testErrorHandler{t}, ScanComments|dontInsertSemis)
 	index := 0
-	epos := token.Position{"", 0, 1, 1} // expected position
+	// epos is the expected position
+	epos := token.Position{
+		Filename: "",
+		Offset:   0,
+		Line:     1,
+		Column:   1,
+	}
 	for {
 		pos, tok, lit := s.Scan()
 		if lit == "" {
@@ -505,7 +511,12 @@ func TestLineComments(t *testing.T) {
 	for _, s := range segs {
 		p, _, lit := S.Scan()
 		pos := file.Position(p)
-		checkPos(t, lit, p, token.Position{s.filename, pos.Offset, s.line, pos.Column})
+		checkPos(t, lit, p, token.Position{
+			Filename: s.filename,
+			Offset:   pos.Offset,
+			Line:     s.line,
+			Column:   pos.Column,
+		})
 	}
 
 	if S.ErrorCount != 0 {

src/pkg/html/template/escape_test.go

@@ -1471,7 +1471,7 @@ func TestEscapeText(t *testing.T) {
 
 	for _, test := range tests {
 		b, e := []byte(test.input), newEscaper(nil)
-		c := e.escapeText(context{}, &parse.TextNode{parse.NodeText, b})
+		c := e.escapeText(context{}, &parse.TextNode{NodeType: parse.NodeText, Text: b})
 		if !test.output.eq(c) {
 			t.Errorf("input %q: want context\n\t%v\ngot\n\t%v", test.input, test.output, c)
 			continue

src/pkg/image/draw/bench_test.go

@@ -56,7 +56,7 @@ func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) {
 	var src image.Image
 	switch scm {
 	case nil:
-		src = &image.Uniform{color.RGBA{0x11, 0x22, 0x33, 0xff}}
+		src = &image.Uniform{C: color.RGBA{0x11, 0x22, 0x33, 0xff}}
 	case color.RGBAModel:
 		src1 := image.NewRGBA(image.Rect(0, 0, srcw, srch))
 		for y := 0; y < srch; y++ {
@@ -145,7 +145,7 @@ func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) {
 		x := 3 * i % (dstw - srcw)
 		y := 7 * i % (dsth - srch)
 
-		DrawMask(dst, dst.Bounds().Add(image.Point{x, y}), src, image.ZP, mask, image.ZP, op)
+		DrawMask(dst, dst.Bounds().Add(image.Pt(x, y)), src, image.ZP, mask, image.ZP, op)
 	}
 }
 

src/pkg/image/draw/draw_test.go

@@ -168,15 +168,15 @@ func makeGolden(dst image.Image, r image.Rectangle, src image.Image, sp image.Po
 		sy := y + sp.Y - r.Min.Y
 		my := y + mp.Y - r.Min.Y
 		for x := r.Min.X; x < r.Max.X; x++ {
-			if !(image.Point{x, y}.In(b)) {
+			if !(image.Pt(x, y).In(b)) {
 				continue
 			}
 			sx := x + sp.X - r.Min.X
-			if !(image.Point{sx, sy}.In(sb)) {
+			if !(image.Pt(sx, sy).In(sb)) {
 				continue
 			}
 			mx := x + mp.X - r.Min.X
-			if !(image.Point{mx, my}.In(mb)) {
+			if !(image.Pt(mx, my).In(mb)) {
 				continue
 			}
 
@@ -313,7 +313,7 @@ func TestFill(t *testing.T) {
 		m := image.NewRGBA(image.Rect(0, 0, 40, 30)).SubImage(r).(*image.RGBA)
 		b := m.Bounds()
 		c := color.RGBA{11, 0, 0, 255}
-		src := &image.Uniform{c}
+		src := &image.Uniform{C: c}
 		check := func(desc string) {
 			for y := b.Min.Y; y < b.Max.Y; y++ {
 				for x := b.Min.X; x < b.Max.X; x++ {
@@ -333,21 +333,21 @@ func TestFill(t *testing.T) {
 		check("pixel")
 		// Draw 1 row at a time.
 		c = color.RGBA{0, 22, 0, 255}
-		src = &image.Uniform{c}
+		src = &image.Uniform{C: c}
 		for y := b.Min.Y; y < b.Max.Y; y++ {
 			DrawMask(m, image.Rect(b.Min.X, y, b.Max.X, y+1), src, image.ZP, nil, image.ZP, Src)
 		}
 		check("row")
 		// Draw 1 column at a time.
 		c = color.RGBA{0, 0, 33, 255}
-		src = &image.Uniform{c}
+		src = &image.Uniform{C: c}
 		for x := b.Min.X; x < b.Max.X; x++ {
 			DrawMask(m, image.Rect(x, b.Min.Y, x+1, b.Max.Y), src, image.ZP, nil, image.ZP, Src)
 		}
 		check("column")
 		// Draw the whole image at once.
 		c = color.RGBA{44, 55, 66, 77}
-		src = &image.Uniform{c}
+		src = &image.Uniform{C: c}
 		DrawMask(m, b, src, image.ZP, nil, image.ZP, Src)
 		check("whole")
 	}

src/pkg/image/gif/reader.go

@@ -416,7 +416,11 @@ func DecodeConfig(r io.Reader) (image.Config, error) {
 	if err := d.decode(r, true); err != nil {
 		return image.Config{}, err
 	}
-	return image.Config{d.globalColorMap, d.width, d.height}, nil
+	return image.Config{
+		ColorModel: d.globalColorMap,
+		Width:      d.width,
+		Height:     d.height,
+	}, nil
 }
 
 func init() {

src/pkg/image/jpeg/reader.go

@@ -454,9 +454,17 @@ func DecodeConfig(r io.Reader) (image.Config, error) {
 	}
 	switch d.nComp {
 	case nGrayComponent:
-		return image.Config{color.GrayModel, d.width, d.height}, nil
+		return image.Config{
+			ColorModel: color.GrayModel,
+			Width:      d.width,
+			Height:     d.height,
+		}, nil
 	case nColorComponent:
-		return image.Config{color.YCbCrModel, d.width, d.height}, nil
+		return image.Config{
+			ColorModel: color.YCbCrModel,
+			Width:      d.width,
+			Height:     d.height,
+		}, nil
 	}
 	return image.Config{}, FormatError("missing SOF marker")
 }

src/pkg/image/jpeg/writer.go

@@ -458,7 +458,7 @@ func (e *encoder) writeSOS(m image.Image) {
 			for i := 0; i < 4; i++ {
 				xOff := (i & 1) * 8
 				yOff := (i & 2) * 4
-				p := image.Point{x + xOff, y + yOff}
+				p := image.Pt(x+xOff, y+yOff)
 				if rgba != nil {
 					rgbaToYCbCr(rgba, p, &yBlock, &cbBlock[i], &crBlock[i])
 				} else {

src/pkg/image/png/reader.go

@@ -690,7 +690,11 @@ func DecodeConfig(r io.Reader) (image.Config, error) {
 	case cbTCA16:
 		cm = color.NRGBA64Model
 	}
-	return image.Config{cm, d.width, d.height}, nil
+	return image.Config{
+		ColorModel: cm,
+		Width:      d.width,
+		Height:     d.height,
+	}, nil
 }
 
 func init() {

src/pkg/net/http/client.go

@@ -245,7 +245,11 @@ func (c *Client) doFollowingRedirects(ireq *Request) (r *Response, err error) {
 	}
 
 	method := ireq.Method
-	err = &url.Error{method[0:1] + strings.ToLower(method[1:]), urlStr, err}
+	err = &url.Error{
+		Op:  method[0:1] + strings.ToLower(method[1:]),
+		URL: urlStr,
+		Err: err,
+	}
 	return
 }
 

src/pkg/net/http/httputil/persist.go

@@ -18,8 +18,8 @@ import (
 )
 
 var (
-	ErrPersistEOF = &http.ProtocolError{"persistent connection closed"}
-	ErrPipeline   = &http.ProtocolError{"pipeline error"}
+	ErrPersistEOF = &http.ProtocolError{ErrorString: "persistent connection closed"}
+	ErrPipeline   = &http.ProtocolError{ErrorString: "pipeline error"}
 )
 
 // This is an API usage error - the local side is closed.

src/pkg/net/newpollserver.go

@@ -36,7 +36,11 @@ func newPollServer() (s *pollServer, err error) {
 	return s, nil
 
 Errno:
-	err = &os.PathError{"setnonblock", s.pr.Name(), err}
+	err = &os.PathError{
+		Op:   "setnonblock",
+		Path: s.pr.Name(),
+		Err:  err,
+	}
 Error:
 	s.pr.Close()
 	s.pw.Close()

src/pkg/net/rpc/client.go

@@ -232,7 +232,12 @@ func DialHTTPPath(network, address, path string) (*Client, error) {
 		err = errors.New("unexpected HTTP response: " + resp.Status)
 	}
 	conn.Close()
-	return nil, &net.OpError{"dial-http", network + " " + address, nil, err}
+	return nil, &net.OpError{
+		Op:   "dial-http",
+		Net:  network + " " + address,
+		Addr: nil,
+		Err:  err,
+	}
 }
 
 // Dial connects to an RPC server at the specified network address.

src/pkg/net/smtp/smtp.go

@@ -155,7 +155,7 @@ func (c *Client) Auth(a Auth) error {
 			// the last message isn't base64 because it isn't a challenge
 			msg = []byte(msg64)
 		default:
-			err = &textproto.Error{code, msg64}
+			err = &textproto.Error{Code: code, Msg: msg64}
 		}
 		resp, err = a.Next(msg, code == 334)
 		if err != nil {

src/pkg/os/exec_windows.go

@@ -29,7 +29,7 @@ func (p *Process) Wait(options int) (w *Waitmsg, err error) {
 		return nil, NewSyscallError("GetExitCodeProcess", e)
 	}
 	p.done = true
-	return &Waitmsg{p.Pid, syscall.WaitStatus{s, ec}, new(syscall.Rusage)}, nil
+	return &Waitmsg{p.Pid, syscall.WaitStatus{Status: s, ExitCode: ec}, new(syscall.Rusage)}, nil
 }
 
 // Signal sends a signal to the Process.

src/pkg/regexp/syntax/parse.go

@@ -1377,8 +1377,8 @@ func (p *parser) appendGroup(r []rune, g charGroup) []rune {
 }
 
 var anyTable = &unicode.RangeTable{
-	[]unicode.Range16{{0, 1<<16 - 1, 1}},
-	[]unicode.Range32{{1 << 16, unicode.MaxRune, 1}},
+	R16: []unicode.Range16{{Lo: 0, Hi: 1<<16 - 1, Stride: 1}},
+	R32: []unicode.Range32{{Lo: 1 << 16, Hi: unicode.MaxRune, Stride: 1}},
 }
 
 // unicodeTable returns the unicode.RangeTable identified by name

src/pkg/unicode/maketables.go

@@ -652,7 +652,11 @@ func foldAdjacent(r []Script) []unicode.Range32 {
 			s[j-1].Hi = r[i].hi
 		} else {
 			s = s[0 : j+1]
-			s[j] = unicode.Range32{uint32(r[i].lo), uint32(r[i].hi), 1}
+			s[j] = unicode.Range32{
+				Lo:     uint32(r[i].lo),
+				Hi:     uint32(r[i].hi),
+				Stride: 1,
+			}
 			j++
 		}
 	}