libgo: Update to weekly.2011-11-02.

From-SVN: r181964

14 files changed, 89 insertions, 95 deletions

diff --git a/libgo/go/encoding/ascii85/ascii85.go b/libgo/go/encoding/ascii85/ascii85.go
index ead0c24..6f592f3 100644
--- a/libgo/go/encoding/ascii85/ascii85.go
+++ b/libgo/go/encoding/ascii85/ascii85.go
@@ -8,7 +8,6 @@ package ascii85
 
 import (
 	"io"
-	"os"
 	"strconv"
 )
 
@@ -93,14 +92,14 @@ func MaxEncodedLen(n int) int { return (n + 3) / 4 * 5 }
 func NewEncoder(w io.Writer) io.WriteCloser { return &encoder{w: w} }
 
 type encoder struct {
-	err  os.Error
+	err  error
 	w    io.Writer
 	buf  [4]byte    // buffered data waiting to be encoded
 	nbuf int        // number of bytes in buf
 	out  [1024]byte // output buffer
 }
 
-func (e *encoder) Write(p []byte) (n int, err os.Error) {
+func (e *encoder) Write(p []byte) (n int, err error) {
 	if e.err != nil {
 		return 0, e.err
 	}
@@ -152,7 +151,7 @@ func (e *encoder) Write(p []byte) (n int, err os.Error) {
 
 // Close flushes any pending output from the encoder.
 // It is an error to call Write after calling Close.
-func (e *encoder) Close() os.Error {
+func (e *encoder) Close() error {
 	// If there's anything left in the buffer, flush it out
 	if e.err == nil && e.nbuf > 0 {
 		nout := Encode(e.out[0:], e.buf[0:e.nbuf])
@@ -168,7 +167,7 @@ func (e *encoder) Close() os.Error {
 
 type CorruptInputError int64
 
-func (e CorruptInputError) String() string {
+func (e CorruptInputError) Error() string {
 	return "illegal ascii85 data at input byte " + strconv.Itoa64(int64(e))
 }
 
@@ -186,7 +185,7 @@ func (e CorruptInputError) String() string {
 //
 // NewDecoder wraps an io.Reader interface around Decode.
 //
-func Decode(dst, src []byte, flush bool) (ndst, nsrc int, err os.Error) {
+func Decode(dst, src []byte, flush bool) (ndst, nsrc int, err error) {
 	var v uint32
 	var nb int
 	for i, b := range src {
@@ -246,8 +245,8 @@ func Decode(dst, src []byte, flush bool) (ndst, nsrc int, err os.Error) {
 func NewDecoder(r io.Reader) io.Reader { return &decoder{r: r} }
 
 type decoder struct {
-	err     os.Error
-	readErr os.Error
+	err     error
+	readErr error
 	r       io.Reader
 	end     bool       // saw end of message
 	buf     [1024]byte // leftover input
@@ -256,7 +255,7 @@ type decoder struct {
 	outbuf  [1024]byte
 }
 
-func (d *decoder) Read(p []byte) (n int, err os.Error) {
+func (d *decoder) Read(p []byte) (n int, err error) {
 	if len(p) == 0 {
 		return 0, nil
 	}
diff --git a/libgo/go/encoding/ascii85/ascii85_test.go b/libgo/go/encoding/ascii85/ascii85_test.go
index fdfeb88..70e67d8 100644
--- a/libgo/go/encoding/ascii85/ascii85_test.go
+++ b/libgo/go/encoding/ascii85/ascii85_test.go
@@ -6,8 +6,8 @@ package ascii85
 
 import (
 	"bytes"
+	"io"
 	"io/ioutil"
-	"os"
 	"testing"
 )
 
@@ -83,11 +83,11 @@ func TestEncoderBuffering(t *testing.T) {
 				end = len(input)
 			}
 			n, err := encoder.Write(input[pos:end])
-			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, os.Error(nil))
+			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
 			testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
 		}
 		err := encoder.Close()
-		testEqual(t, "Close gave error %v, want %v", err, os.Error(nil))
+		testEqual(t, "Close gave error %v, want %v", err, error(nil))
 		testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, strip85(bb.String()), strip85(bigtest.encoded))
 	}
 }
@@ -96,7 +96,7 @@ func TestDecode(t *testing.T) {
 	for _, p := range pairs {
 		dbuf := make([]byte, 4*len(p.encoded))
 		ndst, nsrc, err := Decode(dbuf, []byte(p.encoded), true)
-		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, os.Error(nil))
+		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
 		testEqual(t, "Decode(%q) = nsrc %v, want %v", p.encoded, nsrc, len(p.encoded))
 		testEqual(t, "Decode(%q) = ndst %v, want %v", p.encoded, ndst, len(p.decoded))
 		testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:ndst]), p.decoded)
@@ -113,7 +113,7 @@ func TestDecoder(t *testing.T) {
 		testEqual(t, "Read from %q = length %v, want %v", p.encoded, len(dbuf), len(p.decoded))
 		testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf), p.decoded)
 		if err != nil {
-			testEqual(t, "Read from %q = %v, want %v", p.encoded, err, os.EOF)
+			testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
 		}
 	}
 }
@@ -125,7 +125,7 @@ func TestDecoderBuffering(t *testing.T) {
 		var total int
 		for total = 0; total < len(bigtest.decoded); {
 			n, err := decoder.Read(buf[total : total+bs])
-			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, os.Error(nil))
+			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, error(nil))
 			total += n
 		}
 		testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
diff --git a/libgo/go/encoding/base32/base32.go b/libgo/go/encoding/base32/base32.go
index acace30..494c760 100644
--- a/libgo/go/encoding/base32/base32.go
+++ b/libgo/go/encoding/base32/base32.go
@@ -7,7 +7,6 @@ package base32
 
 import (
 	"io"
-	"os"
 	"strconv"
 )
 
@@ -127,7 +126,7 @@ func (enc *Encoding) Encode(dst, src []byte) {
 }
 
 type encoder struct {
-	err  os.Error
+	err  error
 	enc  *Encoding
 	w    io.Writer
 	buf  [5]byte    // buffered data waiting to be encoded
@@ -135,7 +134,7 @@ type encoder struct {
 	out  [1024]byte // output buffer
 }
 
-func (e *encoder) Write(p []byte) (n int, err os.Error) {
+func (e *encoder) Write(p []byte) (n int, err error) {
 	if e.err != nil {
 		return 0, e.err
 	}
@@ -187,7 +186,7 @@ func (e *encoder) Write(p []byte) (n int, err os.Error) {
 
 // Close flushes any pending output from the encoder.
 // It is an error to call Write after calling Close.
-func (e *encoder) Close() os.Error {
+func (e *encoder) Close() error {
 	// If there's anything left in the buffer, flush it out
 	if e.err == nil && e.nbuf > 0 {
 		e.enc.Encode(e.out[0:], e.buf[0:e.nbuf])
@@ -216,7 +215,7 @@ func (enc *Encoding) EncodedLen(n int) int { return (n + 4) / 5 * 8 }
 
 type CorruptInputError int64
 
-func (e CorruptInputError) String() string {
+func (e CorruptInputError) Error() string {
 	return "illegal base32 data at input byte " + strconv.Itoa64(int64(e))
 }
 
@@ -224,7 +223,7 @@ func (e CorruptInputError) String() string {
 // indicates if end-of-message padding was encountered and thus any
 // additional data is an error.  decode also assumes len(src)%8==0,
 // since it is meant for internal use.
-func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err os.Error) {
+func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
 	for i := 0; i < len(src)/8 && !end; i++ {
 		// Decode quantum using the base32 alphabet
 		var dbuf [8]byte
@@ -290,7 +289,7 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err os.Error) {
 // DecodedLen(len(src)) bytes to dst and returns the number of bytes
 // written.  If src contains invalid base32 data, it will return the
 // number of bytes successfully written and CorruptInputError.
-func (enc *Encoding) Decode(dst, src []byte) (n int, err os.Error) {
+func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
 	if len(src)%8 != 0 {
 		return 0, CorruptInputError(len(src) / 8 * 8)
 	}
@@ -300,7 +299,7 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err os.Error) {
 }
 
 type decoder struct {
-	err    os.Error
+	err    error
 	enc    *Encoding
 	r      io.Reader
 	end    bool       // saw end of message
@@ -310,7 +309,7 @@ type decoder struct {
 	outbuf [1024 / 8 * 5]byte
 }
 
-func (d *decoder) Read(p []byte) (n int, err os.Error) {
+func (d *decoder) Read(p []byte) (n int, err error) {
 	if d.err != nil {
 		return 0, d.err
 	}
diff --git a/libgo/go/encoding/base32/base32_test.go b/libgo/go/encoding/base32/base32_test.go
index 3fa1c2b..facf5d0 100644
--- a/libgo/go/encoding/base32/base32_test.go
+++ b/libgo/go/encoding/base32/base32_test.go
@@ -6,8 +6,8 @@ package base32
 
 import (
 	"bytes"
+	"io"
 	"io/ioutil"
-	"os"
 	"testing"
 )
 
@@ -78,11 +78,11 @@ func TestEncoderBuffering(t *testing.T) {
 				end = len(input)
 			}
 			n, err := encoder.Write(input[pos:end])
-			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, os.Error(nil))
+			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
 			testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
 		}
 		err := encoder.Close()
-		testEqual(t, "Close gave error %v, want %v", err, os.Error(nil))
+		testEqual(t, "Close gave error %v, want %v", err, error(nil))
 		testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, bb.String(), bigtest.encoded)
 	}
 }
@@ -91,7 +91,7 @@ func TestDecode(t *testing.T) {
 	for _, p := range pairs {
 		dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
 		count, end, err := StdEncoding.decode(dbuf, []byte(p.encoded))
-		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, os.Error(nil))
+		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
 		testEqual(t, "Decode(%q) = length %v, want %v", p.encoded, count, len(p.decoded))
 		if len(p.encoded) > 0 {
 			testEqual(t, "Decode(%q) = end %v, want %v", p.encoded, end, (p.encoded[len(p.encoded)-1] == '='))
@@ -107,15 +107,15 @@ func TestDecoder(t *testing.T) {
 		decoder := NewDecoder(StdEncoding, bytes.NewBufferString(p.encoded))
 		dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
 		count, err := decoder.Read(dbuf)
-		if err != nil && err != os.EOF {
+		if err != nil && err != io.EOF {
 			t.Fatal("Read failed", err)
 		}
 		testEqual(t, "Read from %q = length %v, want %v", p.encoded, count, len(p.decoded))
 		testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
-		if err != os.EOF {
+		if err != io.EOF {
 			count, err = decoder.Read(dbuf)
 		}
-		testEqual(t, "Read from %q = %v, want %v", p.encoded, err, os.EOF)
+		testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
 	}
 }
 
@@ -126,7 +126,7 @@ func TestDecoderBuffering(t *testing.T) {
 		var total int
 		for total = 0; total < len(bigtest.decoded); {
 			n, err := decoder.Read(buf[total : total+bs])
-			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, os.Error(nil))
+			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, error(nil))
 			total += n
 		}
 		testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
diff --git a/libgo/go/encoding/base64/base64.go b/libgo/go/encoding/base64/base64.go
index c6b2a13e..9451289 100644
--- a/libgo/go/encoding/base64/base64.go
+++ b/libgo/go/encoding/base64/base64.go
@@ -7,7 +7,6 @@ package base64
 
 import (
 	"io"
-	"os"
 	"strconv"
 )
 
@@ -114,7 +113,7 @@ func (enc *Encoding) EncodeToString(src []byte) string {
 }
 
 type encoder struct {
-	err  os.Error
+	err  error
 	enc  *Encoding
 	w    io.Writer
 	buf  [3]byte    // buffered data waiting to be encoded
@@ -122,7 +121,7 @@ type encoder struct {
 	out  [1024]byte // output buffer
 }
 
-func (e *encoder) Write(p []byte) (n int, err os.Error) {
+func (e *encoder) Write(p []byte) (n int, err error) {
 	if e.err != nil {
 		return 0, e.err
 	}
@@ -174,7 +173,7 @@ func (e *encoder) Write(p []byte) (n int, err os.Error) {
 
 // Close flushes any pending output from the encoder.
 // It is an error to call Write after calling Close.
-func (e *encoder) Close() os.Error {
+func (e *encoder) Close() error {
 	// If there's anything left in the buffer, flush it out
 	if e.err == nil && e.nbuf > 0 {
 		e.enc.Encode(e.out[0:], e.buf[0:e.nbuf])
@@ -203,7 +202,7 @@ func (enc *Encoding) EncodedLen(n int) int { return (n + 2) / 3 * 4 }
 
 type CorruptInputError int64
 
-func (e CorruptInputError) String() string {
+func (e CorruptInputError) Error() string {
 	return "illegal base64 data at input byte " + strconv.Itoa64(int64(e))
 }
 
@@ -211,7 +210,7 @@ func (e CorruptInputError) String() string {
 // indicates if end-of-message padding was encountered and thus any
 // additional data is an error.  decode also assumes len(src)%4==0,
 // since it is meant for internal use.
-func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err os.Error) {
+func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
 	for i := 0; i < len(src)/4 && !end; i++ {
 		// Decode quantum using the base64 alphabet
 		var dbuf [4]byte
@@ -258,7 +257,7 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err os.Error) {
 // DecodedLen(len(src)) bytes to dst and returns the number of bytes
 // written.  If src contains invalid base64 data, it will return the
 // number of bytes successfully written and CorruptInputError.
-func (enc *Encoding) Decode(dst, src []byte) (n int, err os.Error) {
+func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
 	if len(src)%4 != 0 {
 		return 0, CorruptInputError(len(src) / 4 * 4)
 	}
@@ -268,14 +267,14 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err os.Error) {
 }
 
 // DecodeString returns the bytes represented by the base64 string s.
-func (enc *Encoding) DecodeString(s string) ([]byte, os.Error) {
+func (enc *Encoding) DecodeString(s string) ([]byte, error) {
 	dbuf := make([]byte, enc.DecodedLen(len(s)))
 	n, err := enc.Decode(dbuf, []byte(s))
 	return dbuf[:n], err
 }
 
 type decoder struct {
-	err    os.Error
+	err    error
 	enc    *Encoding
 	r      io.Reader
 	end    bool       // saw end of message
@@ -285,7 +284,7 @@ type decoder struct {
 	outbuf [1024 / 4 * 3]byte
 }
 
-func (d *decoder) Read(p []byte) (n int, err os.Error) {
+func (d *decoder) Read(p []byte) (n int, err error) {
 	if d.err != nil {
 		return 0, d.err
 	}
diff --git a/libgo/go/encoding/base64/base64_test.go b/libgo/go/encoding/base64/base64_test.go
index c163dae..8310d8ab 100644
--- a/libgo/go/encoding/base64/base64_test.go
+++ b/libgo/go/encoding/base64/base64_test.go
@@ -6,8 +6,8 @@ package base64
 
 import (
 	"bytes"
+	"io"
 	"io/ioutil"
-	"os"
 	"testing"
 )
 
@@ -82,11 +82,11 @@ func TestEncoderBuffering(t *testing.T) {
 				end = len(input)
 			}
 			n, err := encoder.Write(input[pos:end])
-			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, os.Error(nil))
+			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
 			testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
 		}
 		err := encoder.Close()
-		testEqual(t, "Close gave error %v, want %v", err, os.Error(nil))
+		testEqual(t, "Close gave error %v, want %v", err, error(nil))
 		testEqual(t, "Encoding/%d of %q = %q, want %q", bs, bigtest.decoded, bb.String(), bigtest.encoded)
 	}
 }
@@ -95,7 +95,7 @@ func TestDecode(t *testing.T) {
 	for _, p := range pairs {
 		dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
 		count, end, err := StdEncoding.decode(dbuf, []byte(p.encoded))
-		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, os.Error(nil))
+		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
 		testEqual(t, "Decode(%q) = length %v, want %v", p.encoded, count, len(p.decoded))
 		if len(p.encoded) > 0 {
 			testEqual(t, "Decode(%q) = end %v, want %v", p.encoded, end, (p.encoded[len(p.encoded)-1] == '='))
@@ -103,7 +103,7 @@ func TestDecode(t *testing.T) {
 		testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
 
 		dbuf, err = StdEncoding.DecodeString(p.encoded)
-		testEqual(t, "DecodeString(%q) = error %v, want %v", p.encoded, err, os.Error(nil))
+		testEqual(t, "DecodeString(%q) = error %v, want %v", p.encoded, err, error(nil))
 		testEqual(t, "DecodeString(%q) = %q, want %q", string(dbuf), p.decoded)
 	}
 }
@@ -113,15 +113,15 @@ func TestDecoder(t *testing.T) {
 		decoder := NewDecoder(StdEncoding, bytes.NewBufferString(p.encoded))
 		dbuf := make([]byte, StdEncoding.DecodedLen(len(p.encoded)))
 		count, err := decoder.Read(dbuf)
-		if err != nil && err != os.EOF {
+		if err != nil && err != io.EOF {
 			t.Fatal("Read failed", err)
 		}
 		testEqual(t, "Read from %q = length %v, want %v", p.encoded, count, len(p.decoded))
 		testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf[0:count]), p.decoded)
-		if err != os.EOF {
+		if err != io.EOF {
 			count, err = decoder.Read(dbuf)
 		}
-		testEqual(t, "Read from %q = %v, want %v", p.encoded, err, os.EOF)
+		testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
 	}
 }
 
@@ -132,7 +132,7 @@ func TestDecoderBuffering(t *testing.T) {
 		var total int
 		for total = 0; total < len(bigtest.decoded); {
 			n, err := decoder.Read(buf[total : total+bs])
-			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, os.Error(nil))
+			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", bigtest.encoded, total, n, err, error(nil))
 			total += n
 		}
 		testEqual(t, "Decoding/%d of %q = %q, want %q", bs, bigtest.encoded, string(buf[0:total]), bigtest.decoded)
diff --git a/libgo/go/encoding/binary/binary.go b/libgo/go/encoding/binary/binary.go
index c58f736..65b9f01 100644
--- a/libgo/go/encoding/binary/binary.go
+++ b/libgo/go/encoding/binary/binary.go
@@ -8,9 +8,9 @@
 package binary
 
 import (
+	"errors"
 	"math"
 	"io"
-	"os"
 	"reflect"
 )
 
@@ -124,7 +124,7 @@ func (bigEndian) GoString() string { return "binary.BigEndian" }
 // or an array or struct containing only fixed-size values.
 // Bytes read from r are decoded using the specified byte order
 // and written to successive fields of the data.
-func Read(r io.Reader, order ByteOrder, data interface{}) os.Error {
+func Read(r io.Reader, order ByteOrder, data interface{}) error {
 	// Fast path for basic types.
 	if n := intDestSize(data); n != 0 {
 		var b [8]byte
@@ -161,11 +161,11 @@ func Read(r io.Reader, order ByteOrder, data interface{}) os.Error {
 	case reflect.Slice:
 		v = d
 	default:
-		return os.NewError("binary.Read: invalid type " + d.Type().String())
+		return errors.New("binary.Read: invalid type " + d.Type().String())
 	}
 	size := TotalSize(v)
 	if size < 0 {
-		return os.NewError("binary.Read: invalid type " + v.Type().String())
+		return errors.New("binary.Read: invalid type " + v.Type().String())
 	}
 	d := &decoder{order: order, buf: make([]byte, size)}
 	if _, err := io.ReadFull(r, d.buf); err != nil {
@@ -183,7 +183,7 @@ func Read(r io.Reader, order ByteOrder, data interface{}) os.Error {
 // or an array or struct containing only fixed-size values.
 // Bytes written to w are encoded using the specified byte order
 // and read from successive fields of the data.
-func Write(w io.Writer, order ByteOrder, data interface{}) os.Error {
+func Write(w io.Writer, order ByteOrder, data interface{}) error {
 	// Fast path for basic types.
 	var b [8]byte
 	var bs []byte
@@ -244,7 +244,7 @@ func Write(w io.Writer, order ByteOrder, data interface{}) os.Error {
 	v := reflect.Indirect(reflect.ValueOf(data))
 	size := TotalSize(v)
 	if size < 0 {
-		return os.NewError("binary.Write: invalid type " + v.Type().String())
+		return errors.New("binary.Write: invalid type " + v.Type().String())
 	}
 	buf := make([]byte, size)
 	e := &encoder{order: order, buf: buf}
diff --git a/libgo/go/encoding/binary/binary_test.go b/libgo/go/encoding/binary/binary_test.go
index ef20605..e753aa0 100644
--- a/libgo/go/encoding/binary/binary_test.go
+++ b/libgo/go/encoding/binary/binary_test.go
@@ -7,8 +7,8 @@ package binary
 import (
 	"bytes"
 	"io"
+	"bytes"
 	"math"
-	"os"
 	"reflect"
 	"testing"
 )
@@ -99,7 +99,7 @@ var little = []byte{
 var src = []byte{1, 2, 3, 4, 5, 6, 7, 8}
 var res = []int32{0x01020304, 0x05060708}
 
-func checkResult(t *testing.T, dir string, order ByteOrder, err os.Error, have, want interface{}) {
+func checkResult(t *testing.T, dir string, order ByteOrder, err error, have, want interface{}) {
 	if err != nil {
 		t.Errorf("%v %v: %v", dir, order, err)
 		return
@@ -166,7 +166,7 @@ type byteSliceReader struct {
 	remain []byte
 }
 
-func (br *byteSliceReader) Read(p []byte) (int, os.Error) {
+func (br *byteSliceReader) Read(p []byte) (int, error) {
 	n := copy(p, br.remain)
 	br.remain = br.remain[n:]
 	return n, nil
diff --git a/libgo/go/encoding/binary/varint.go b/libgo/go/encoding/binary/varint.go
index c98e0e2..d4872ee 100644
--- a/libgo/go/encoding/binary/varint.go
+++ b/libgo/go/encoding/binary/varint.go
@@ -25,8 +25,8 @@ package binary
 // format incompatible with a varint encoding for larger numbers (say 128-bit).
 
 import (
+	"errors"
 	"io"
-	"os"
 )
 
 // MaxVarintLenN is the maximum length of a varint-encoded N-bit integer.
@@ -99,17 +99,17 @@ func Varint(buf []byte) (int64, int) {
 }
 
 // WriteUvarint encodes x and writes the result to w.
-func WriteUvarint(w io.Writer, x uint64) os.Error {
+func WriteUvarint(w io.Writer, x uint64) error {
 	var buf [MaxVarintLen64]byte
 	n := PutUvarint(buf[:], x)
 	_, err := w.Write(buf[0:n])
 	return err
 }
 
-var overflow = os.NewError("binary: varint overflows a 64-bit integer")
+var overflow = errors.New("binary: varint overflows a 64-bit integer")
 
 // ReadUvarint reads an encoded unsigned integer from r and returns it as a uint64.
-func ReadUvarint(r io.ByteReader) (uint64, os.Error) {
+func ReadUvarint(r io.ByteReader) (uint64, error) {
 	var x uint64
 	var s uint
 	for i := 0; ; i++ {
@@ -130,7 +130,7 @@ func ReadUvarint(r io.ByteReader) (uint64, os.Error) {
 }
 
 // WriteVarint encodes x and writes the result to w.
-func WriteVarint(w io.Writer, x int64) os.Error {
+func WriteVarint(w io.Writer, x int64) error {
 	ux := uint64(x) << 1
 	if x < 0 {
 		ux = ^ux
@@ -139,7 +139,7 @@ func WriteVarint(w io.Writer, x int64) os.Error {
 }
 
 // ReadVarint reads an encoded unsigned integer from r and returns it as a uint64.
-func ReadVarint(r io.ByteReader) (int64, os.Error) {
+func ReadVarint(r io.ByteReader) (int64, error) {
 	ux, err := ReadUvarint(r) // ok to continue in presence of error
 	x := int64(ux >> 1)
 	if ux&1 != 0 {
diff --git a/libgo/go/encoding/binary/varint_test.go b/libgo/go/encoding/binary/varint_test.go
index ef51f09..b553d6d 100644
--- a/libgo/go/encoding/binary/varint_test.go
+++ b/libgo/go/encoding/binary/varint_test.go
@@ -6,7 +6,7 @@ package binary
 
 import (
 	"bytes"
-	"os"
+	"io"
 	"testing"
 )
 
@@ -131,13 +131,13 @@ func TestBufferTooSmall(t *testing.T) {
 		}
 
 		x, err := ReadUvarint(bytes.NewBuffer(buf))
-		if x != 0 || err != os.EOF {
+		if x != 0 || err != io.EOF {
 			t.Errorf("ReadUvarint(%v): got x = %d, err = %s", buf, x, err)
 		}
 	}
 }
 
-func testOverflow(t *testing.T, buf []byte, n0 int, err0 os.Error) {
+func testOverflow(t *testing.T, buf []byte, n0 int, err0 error) {
 	x, n := Uvarint(buf)
 	if x != 0 || n != n0 {
 		t.Errorf("Uvarint(%v): got x = %d, n = %d; want 0, %d", buf, x, n, n0)
diff --git a/libgo/go/encoding/git85/git.go b/libgo/go/encoding/git85/git.go
index 6bb74f4..b6ad6e2 100644
--- a/libgo/go/encoding/git85/git.go
+++ b/libgo/go/encoding/git85/git.go
@@ -9,13 +9,12 @@ package git85
 import (
 	"bytes"
 	"io"
-	"os"
 	"strconv"
 )
 
 type CorruptInputError int64
 
-func (e CorruptInputError) String() string {
+func (e CorruptInputError) Error() string {
 	return "illegal git85 data at input byte " + strconv.Itoa64(int64(e))
 }
 
@@ -96,7 +95,7 @@ var newline = []byte{'\n'}
 //
 // If Decode encounters invalid input, it returns a CorruptInputError.
 //
-func Decode(dst, src []byte) (n int, err os.Error) {
+func Decode(dst, src []byte) (n int, err error) {
 	ndst := 0
 	nsrc := 0
 	for nsrc < len(src) {
@@ -153,14 +152,14 @@ func NewEncoder(w io.Writer) io.WriteCloser { return &encoder{w: w} }
 
 type encoder struct {
 	w    io.Writer
-	err  os.Error
+	err  error
 	buf  [52]byte
 	nbuf int
 	out  [1024]byte
 	nout int
 }
 
-func (e *encoder) Write(p []byte) (n int, err os.Error) {
+func (e *encoder) Write(p []byte) (n int, err error) {
 	if e.err != nil {
 		return 0, e.err
 	}
@@ -209,7 +208,7 @@ func (e *encoder) Write(p []byte) (n int, err os.Error) {
 	return
 }
 
-func (e *encoder) Close() os.Error {
+func (e *encoder) Close() error {
 	// If there's anything left in the buffer, flush it out
 	if e.err == nil && e.nbuf > 0 {
 		nout := Encode(e.out[0:], e.buf[0:e.nbuf])
@@ -224,8 +223,8 @@ func NewDecoder(r io.Reader) io.Reader { return &decoder{r: r} }
 
 type decoder struct {
 	r       io.Reader
-	err     os.Error
-	readErr os.Error
+	err     error
+	readErr error
 	buf     [1024]byte
 	nbuf    int
 	out     []byte
@@ -233,7 +232,7 @@ type decoder struct {
 	off     int64
 }
 
-func (d *decoder) Read(p []byte) (n int, err os.Error) {
+func (d *decoder) Read(p []byte) (n int, err error) {
 	if len(p) == 0 {
 		return 0, nil
 	}
diff --git a/libgo/go/encoding/git85/git_test.go b/libgo/go/encoding/git85/git_test.go
index c76385c..81f5b0e 100644
--- a/libgo/go/encoding/git85/git_test.go
+++ b/libgo/go/encoding/git85/git_test.go
@@ -6,8 +6,8 @@ package git85
 
 import (
 	"bytes"
+	"io"
 	"io/ioutil"
-	"os"
 	"testing"
 )
 
@@ -90,11 +90,11 @@ func TestEncoderBuffering(t *testing.T) {
 				end = len(input)
 			}
 			n, err := encoder.Write(input[pos:end])
-			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, os.Error(nil))
+			testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, error(nil))
 			testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
 		}
 		err := encoder.Close()
-		testEqual(t, "Close gave error %v, want %v", err, os.Error(nil))
+		testEqual(t, "Close gave error %v, want %v", err, error(nil))
 		testEqual(t, "Encoding/%d of %q = %q, want %q", bs, gitBigtest.decoded, bb.String(), gitBigtest.encoded)
 	}
 }
@@ -103,7 +103,7 @@ func TestDecode(t *testing.T) {
 	for _, p := range gitPairs {
 		dbuf := make([]byte, 4*len(p.encoded))
 		ndst, err := Decode(dbuf, []byte(p.encoded))
-		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, os.Error(nil))
+		testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, error(nil))
 		testEqual(t, "Decode(%q) = ndst %v, want %v", p.encoded, ndst, len(p.decoded))
 		testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:ndst]), p.decoded)
 	}
@@ -119,7 +119,7 @@ func TestDecoder(t *testing.T) {
 		testEqual(t, "Read from %q = length %v, want %v", p.encoded, len(dbuf), len(p.decoded))
 		testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf), p.decoded)
 		if err != nil {
-			testEqual(t, "Read from %q = %v, want %v", p.encoded, err, os.EOF)
+			testEqual(t, "Read from %q = %v, want %v", p.encoded, err, io.EOF)
 		}
 	}
 }
@@ -131,7 +131,7 @@ func TestDecoderBuffering(t *testing.T) {
 		var total int
 		for total = 0; total < len(gitBigtest.decoded); {
 			n, err := decoder.Read(buf[total : total+bs])
-			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", gitBigtest.encoded, total, n, err, os.Error(nil))
+			testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", gitBigtest.encoded, total, n, err, error(nil))
 			total += n
 		}
 		testEqual(t, "Decoding/%d of %q = %q, want %q", bs, gitBigtest.encoded, string(buf[0:total]), gitBigtest.decoded)
diff --git a/libgo/go/encoding/hex/hex.go b/libgo/go/encoding/hex/hex.go
index e7ea8b0..eb7e7ca 100644
--- a/libgo/go/encoding/hex/hex.go
+++ b/libgo/go/encoding/hex/hex.go
@@ -8,7 +8,6 @@ package hex
 import (
 	"bytes"
 	"io"
-	"os"
 	"strconv"
 )
 
@@ -33,12 +32,12 @@ func Encode(dst, src []byte) int {
 // OddLengthInputError results from decoding an odd length slice.
 type OddLengthInputError struct{}
 
-func (OddLengthInputError) String() string { return "odd length hex string" }
+func (OddLengthInputError) Error() string { return "odd length hex string" }
 
 // InvalidHexCharError results from finding an invalid character in a hex string.
 type InvalidHexCharError byte
 
-func (e InvalidHexCharError) String() string {
+func (e InvalidHexCharError) Error() string {
 	return "invalid hex char: " + strconv.Itoa(int(e))
 }
 
@@ -49,7 +48,7 @@ func DecodedLen(x int) int { return x / 2 }
 //
 // If Decode encounters invalid input, it returns an OddLengthInputError or an
 // InvalidHexCharError.
-func Decode(dst, src []byte) (int, os.Error) {
+func Decode(dst, src []byte) (int, error) {
 	if len(src)%2 == 1 {
 		return 0, OddLengthInputError{}
 	}
@@ -91,7 +90,7 @@ func EncodeToString(src []byte) string {
 }
 
 // DecodeString returns the bytes represented by the hexadecimal string s.
-func DecodeString(s string) ([]byte, os.Error) {
+func DecodeString(s string) ([]byte, error) {
 	src := []byte(s)
 	dst := make([]byte, DecodedLen(len(src)))
 	_, err := Decode(dst, src)
@@ -133,7 +132,7 @@ func toChar(b byte) byte {
 	return b
 }
 
-func (h *dumper) Write(data []byte) (n int, err os.Error) {
+func (h *dumper) Write(data []byte) (n int, err error) {
 	// Output lines look like:
 	// 00000010  2e 2f 30 31 32 33 34 35  36 37 38 39 3a 3b 3c 3d  |./0123456789:;<=|
 	// ^ offset                          ^ extra space              ^ ASCII of line.
@@ -185,7 +184,7 @@ func (h *dumper) Write(data []byte) (n int, err os.Error) {
 	return
 }
 
-func (h *dumper) Close() (err os.Error) {
+func (h *dumper) Close() (err error) {
 	// See the comments in Write() for the details of this format.
 	if h.used == 0 {
 		return
diff --git a/libgo/go/encoding/pem/pem.go b/libgo/go/encoding/pem/pem.go
index 12689b5..3eb7c9f 100644
--- a/libgo/go/encoding/pem/pem.go
+++ b/libgo/go/encoding/pem/pem.go
@@ -11,7 +11,6 @@ import (
 	"bytes"
 	"encoding/base64"
 	"io"
-	"os"
 )
 
 // A Block represents a PEM encoded structure.
@@ -170,7 +169,7 @@ type lineBreaker struct {
 	out  io.Writer
 }
 
-func (l *lineBreaker) Write(b []byte) (n int, err os.Error) {
+func (l *lineBreaker) Write(b []byte) (n int, err error) {
 	if l.used+len(b) < pemLineLength {
 		copy(l.line[l.used:], b)
 		l.used += len(b)
@@ -197,7 +196,7 @@ func (l *lineBreaker) Write(b []byte) (n int, err os.Error) {
 	return l.Write(b[excess:])
 }
 
-func (l *lineBreaker) Close() (err os.Error) {
+func (l *lineBreaker) Close() (err error) {
 	if l.used > 0 {
 		_, err = l.out.Write(l.line[0:l.used])
 		if err != nil {
@@ -209,7 +208,7 @@ func (l *lineBreaker) Close() (err os.Error) {
 	return
 }
 
-func Encode(out io.Writer, b *Block) (err os.Error) {
+func Encode(out io.Writer, b *Block) (err error) {
 	_, err = out.Write(pemStart[1:])
 	if err != nil {
 		return