}
}

type readFromWriter struct {
	buf           []byte
	writeBytes    int
	readFromBytes int
}

func (w *readFromWriter) Write(p []byte) (int, error) {
	w.buf = append(w.buf, p...)
	w.writeBytes += len(p)
	return len(p), nil
}

func (w *readFromWriter) ReadFrom(r io.Reader) (int64, error) {
	b, err := io.ReadAll(r)

		n, err := buf.Write(testBytes[0:1])
		if want := 1; err != nil || n != want {
			t.Errorf("Write: got (%d, %v), want (%d, %v)", n, err, want, nil)
		}
		check(t, "TestBasicOperations (4)", &buf, "a")

		buf.WriteByte(testString[1])
		check(t, "TestBasicOperations (5)", &buf, "ab")

		n, err = buf.Write(testBytes[2:26])
		if want := 24; err != nil || n != want {
			t.Errorf("Write: got (%d, %v), want (%d, %v)", n, err, want, nil)

	}
	// Buffer is now empty; reset.
	b.Reset()
	return n, nil
}

// WriteByte appends the byte c to the buffer, growing the buffer as needed.
// The returned error is always nil, but is included to match [bufio.Writer]'s
// WriteByte. If the buffer becomes too large, WriteByte will panic with
// [ErrTooLarge].
func (b *Buffer) WriteByte(c byte) error {
	b.lastRead = opInvalid
	m, ok := b.tryGrowByReslice(1)
	if !ok {

pkg hash/maphash, method (*Hash) Sum([]uint8) []uint8
pkg hash/maphash, method (*Hash) Sum64() uint64
pkg hash/maphash, method (*Hash) Write([]uint8) (int, error)
pkg hash/maphash, method (*Hash) WriteByte(uint8) error
pkg hash/maphash, method (*Hash) WriteString(string) (int, error)
pkg hash/maphash, type Hash struct
pkg hash/maphash, type Seed struct
pkg log, const Lmsgprefix = 64
pkg log, const Lmsgprefix ideal-int

pkg bufio, method (*Writer) Available() int
pkg bufio, method (*Writer) Buffered() int
pkg bufio, method (*Writer) Flush() error
pkg bufio, method (*Writer) Write([]uint8) (int, error)
pkg bufio, method (*Writer) WriteByte(uint8) error
pkg bufio, method (*Writer) WriteRune(int32) (int, error)
pkg bufio, method (*Writer) WriteString(string) (int, error)
pkg bufio, method (ReadWriter) Available() int
pkg bufio, method (ReadWriter) Flush() error

pkg image, const YCbCrSubsampleRatio444 = 0
pkg image/draw, const Over = 0
pkg image/draw, const Src = 1
pkg image/jpeg, const DefaultQuality = 75
pkg io, type ByteWriter interface { WriteByte }
pkg io, type ByteWriter interface, WriteByte(uint8) error
pkg io, var ErrNoProgress error
pkg log, const Ldate = 1
pkg log, const Llongfile = 8
pkg log, const Lmicroseconds = 4
pkg log, const Lshortfile = 16

			buf.WriteString(pkg.Name())
			buf.WriteByte('.')
		}
		buf.WriteString(typ.Obj().Name())
		if targs := typ.TypeArgs(); targs.Len() > 0 {
			buf.WriteByte('[')
			for i := 0; i < targs.Len(); i++ {
				if i > 0 {
					buf.WriteString(", ")
				}
				w.writeType(buf, targs.At(i))
			}
			buf.WriteByte(']')
		}

	case *types.TypeParam:

	}
	for i := 0; i < n-1; i++ { // Stop early for \n.
		c := 'a' + byte(lineNum+i)
		if c == '\n' || c == '\r' { // Don't confuse us.
			c = 'N'
		}
		buf.WriteByte(c)
	}
	if addNewline {
		if doCR {
			buf.WriteByte('\r')
		}
		buf.WriteByte('\n')
	}
}

// Test the line splitter, including some carriage returns but no long lines.
func TestScanLongLines(t *testing.T) {

		}
		nn += n
		p = p[n:]
	}
	if b.err != nil {
		return nn, b.err
	}
	n := copy(b.buf[b.n:], p)
	b.n += n
	nn += n
	return nn, nil
}

// WriteByte writes a single byte.
func (b *Writer) WriteByte(c byte) error {
	if b.err != nil {
		return b.err
	}
	if b.Available() <= 0 && b.Flush() != nil {
		return b.err
	}
	b.buf[b.n] = c
	b.n++
	return nil
}

pkg strings, method (*Builder) Len() int
pkg strings, method (*Builder) Reset()
pkg strings, method (*Builder) String() string
pkg strings, method (*Builder) Write([]uint8) (int, error)
pkg strings, method (*Builder) WriteByte(uint8) error
pkg strings, method (*Builder) WriteRune(int32) (int, error)
pkg strings, method (*Builder) WriteString(string) (int, error)
pkg strings, type Builder struct
pkg syscall (freebsd-386), const SYS_UTIMENSAT = 547