// A branch based on the value of CTR. Invert the CTR comparison against zero bit.
						bo ^= 0x2
						invertible = true
					} else if bo&0x04 == 0x04 {
						// A branch based on CR bit. Invert the BI comparison bit.
						bo ^= 0x8
						invertible = true
					}

					if invertible {
						// Rewrite
						//     BC bo,...,far_away_target
						//     NEXT_INSN
						// to:

		{"foo: foo foo\r\n", 200},    // LWS space is okay
		{"foo: foo\tfoo\r\n", 200},   // LWS tab is okay
		{"foo: foo\x00foo\r\n", 400}, // CTL 0x00 in value is bad
		{"foo: foo\x7ffoo\r\n", 400}, // CTL 0x7f in value is bad
		{"foo: foo\xfffoo\r\n", 200}, // non-ASCII high octets in value are fine
	}
	for _, tt := range tests {
		conn := newTestConn()

		for i := 0; i < 10; i++ {
			v := ValueOf(new([]byte)).Elem()
			v.Grow(61)
			b := v.Bytes()
			b = b[:cap(b)]
			for i, c := range b {
				if c != 0 {
					t.Fatalf("Value.Bytes[%d] = 0x%02x, want 0x00", i, c)
				}
				b[i] = 0xff
			}
			runtime.GC()
		}
	})
}

var appendTests = []struct {
	orig, extra []int
}{
	{nil, nil},
	{[]int{}, nil},
	{nil, []int{}},

</p>

<p>
After a backslash, certain single-character escapes represent special values:
</p>

<pre class="grammar">
\a   U+0007 alert or bell
\b   U+0008 backspace
\f   U+000C form feed
\n   U+000A line feed or newline
\r   U+000D carriage return
\t   U+0009 horizontal tab
\v   U+000B vertical tab
\\   U+005C backslash