all: remove various unused unexported functions and constants.

R=golang-dev, minux.ma, rsc
CC=golang-dev, remy
https://golang.org/cl/5702050

src/pkg/archive/zip/reader.go

@@ -169,34 +169,6 @@ func (r *checksumReader) Read(b []byte) (n int, err error) {
 
 func (r *checksumReader) Close() error { return r.rc.Close() }
 
-func readFileHeader(f *File, r io.Reader) error {
-	var buf [fileHeaderLen]byte
-	if _, err := io.ReadFull(r, buf[:]); err != nil {
-		return err
-	}
-	b := readBuf(buf[:])
-	if sig := b.uint32(); sig != fileHeaderSignature {
-		return ErrFormat
-	}
-	f.ReaderVersion = b.uint16()
-	f.Flags = b.uint16()
-	f.Method = b.uint16()
-	f.ModifiedTime = b.uint16()
-	f.ModifiedDate = b.uint16()
-	f.CRC32 = b.uint32()
-	f.CompressedSize = b.uint32()
-	f.UncompressedSize = b.uint32()
-	filenameLen := int(b.uint16())
-	extraLen := int(b.uint16())
-	d := make([]byte, filenameLen+extraLen)
-	if _, err := io.ReadFull(r, d); err != nil {
-		return err
-	}
-	f.Name = string(d[:filenameLen])
-	f.Extra = d[filenameLen:]
-	return nil
-}
-
 // findBodyOffset does the minimum work to verify the file has a header
 // and returns the file body offset.
 func (f *File) findBodyOffset() (int64, error) {

src/pkg/bufio/bufio.go

@@ -23,7 +23,6 @@ var (
 	ErrInvalidUnreadRune = errors.New("bufio: invalid use of UnreadRune")
 	ErrBufferFull        = errors.New("bufio: buffer full")
 	ErrNegativeCount     = errors.New("bufio: negative count")
-	errInternal          = errors.New("bufio: internal error")
 )
 
 // Buffered input.

src/pkg/encoding/json/encode.go

@@ -189,11 +189,6 @@ func (e *MarshalerError) Error() string {
 	return "json: error calling MarshalJSON for type " + e.Type.String() + ": " + e.Err.Error()
 }
 
-type interfaceOrPtrValue interface {
-	IsNil() bool
-	Elem() reflect.Value
-}
-
 var hex = "0123456789abcdef"
 
 // An encodeState encodes JSON into a bytes.Buffer.

src/pkg/net/http/lex.go

@@ -14,14 +14,6 @@ func isSeparator(c byte) bool {
 	return false
 }
 
-func isSpace(c byte) bool {
-	switch c {
-	case ' ', '\t', '\r', '\n':
-		return true
-	}
-	return false
-}
-
 func isCtl(c byte) bool { return (0 <= c && c <= 31) || c == 127 }
 
 func isChar(c byte) bool { return 0 <= c && c <= 127 }

src/pkg/time/format.go

@@ -6,14 +6,6 @@ package time
 
 import "errors"
 
-const (
-	numeric = iota
-	alphabetic
-	separator
-	plus
-	minus
-)
-
 // These are predefined layouts for use in Time.Format.
 // The standard time used in the layouts is:
 //	Mon Jan 2 15:04:05 MST 2006

src/pkg/time/time.go

@@ -767,10 +767,6 @@ func (t Time) UnixNano() int64 {
 	return (t.sec+internalToUnix)*1e9 + int64(t.nsec)
 }
 
-type gobError string
-
-func (g gobError) Error() string { return string(g) }
-
 const timeGobVersion byte = 1
 
 // GobEncode implements the gob.GobEncoder interface.