got := string(readBuf[:n])
			if err != nil || got != want {
				t.Errorf("off %d, size %d = %v, %v (%q); want %q", off, size, n, err, got, want)
			}
		}
	}

}

type zeros struct{}

func (zeros) Read(p []byte) (int, error) {
	clear(p)
	return len(p), nil

			c = ' ' // Treat the checksum field itself as all spaces.
		}
		unsigned += int64(c)
		signed += int64(int8(c))
	}
	return unsigned, signed
}

// reset clears the block with all zeros.
func (b *block) reset() {
	*b = block{}
}

type headerV7 [blockSize]byte

func (h *headerV7) name() []byte     { return h[000:][:100] }
func (h *headerV7) mode() []byte     { return h[100:][:8] }

		if _, err := io.ReadFull(tr.r, tr.blk[:]); err != nil {
			return nil, nil, err // EOF is okay here; exactly 1 block of zeros read
		}
		if bytes.Equal(tr.blk[:], zeroBlock[:]) {
			return nil, nil, io.EOF // normal EOF; exactly 2 block of zeros read
		}
		return nil, nil, ErrHeader // Zero block and then non-zero block
	}

	// Verify the header matches a known format.
	format := tr.blk.getFormat()

	bodyOffset, err := f.findBodyOffset()
	if err != nil {
		return nil, err
	}
	if strings.HasSuffix(f.Name, "/") {
		// The ZIP specification (APPNOTE.TXT) specifies that directories, which
		// are technically zero-byte files, must not have any associated file
		// data. We previously tried failing here if f.CompressedSize64 != 0,
		// but it turns out that a number of implementations (namely, the Java

	// automatically sets the ZIP format's UTF-8 flag for valid UTF-8 strings.
	NonUTF8 bool

	CreatorVersion uint16
	ReaderVersion  uint16
	Flags          uint16

	// Method is the compression method. If zero, Store is used.
	Method uint16

	// Modified is the modified time of the file.
	//
	// When reading, an extended timestamp is preferred over the legacy MS-DOS

	}
	for i := riscv.REG_F0; i <= riscv.REG_F31; i++ {
		name := fmt.Sprintf("F%d", i-riscv.REG_F0)
		register[name] = int16(i)
	}

	// General registers with ABI names.
	register["ZERO"] = riscv.REG_ZERO
	register["RA"] = riscv.REG_RA
	register["SP"] = riscv.REG_SP
	register["GP"] = riscv.REG_GP
	register["TP"] = riscv.REG_TP
	register["T0"] = riscv.REG_T0
	register["T1"] = riscv.REG_T1

	clone[0] = 'd'
	fmt.Printf("%s\n", b)
	fmt.Printf("%s\n", clone)
	// Output:
	// abc
	// abc
	// dbc
}

func ExampleCompare() {
	// Interpret Compare's result by comparing it to zero.
	var a, b []byte
	if bytes.Compare(a, b) < 0 {
		// a less b
	}
	if bytes.Compare(a, b) <= 0 {
		// a less or equal b
	}
	if bytes.Compare(a, b) > 0 {
		// a greater b
	}

// iota is a predeclared identifier representing the untyped integer ordinal
// number of the current const specification in a (usually parenthesized)
// const declaration. It is zero-indexed.
const iota = 0 // Untyped int.

// nil is a predeclared identifier representing the zero value for a
// pointer, channel, func, interface, map, or slice type.
var nil Type // Type must be a pointer, channel, func, interface, map, or slice type

	// end of the token. It's where you are now, and you just read this token.
	if tok == '(' && in.Stack.Col() == prevCol+1 {
		// Macro has arguments. Scan list of formals.
		acceptArg := true
		args = []string{} // Zero length but not nil.
	Loop:
		for {
			tok = in.Stack.Next()
			switch tok {
			case ')':
				tok = in.Stack.Next() // First token of macro definition.
				break Loop
			case ',':
				if acceptArg {

			}
			divisor := p.factor()
			if divisor == 0 {
				p.errorf("division by zero")
			} else {
				value /= divisor
			}
		case '%':
			p.next()
			divisor := p.factor()
			if int64(value) < 0 {
				p.errorf("modulo of value with high bit set")
			}
			if divisor == 0 {
				p.errorf("modulo by zero")
			} else {
				value %= divisor
			}
		case lex.LSH:
			p.next()