</pre>

<p>
In <a href="https://www.unicode.org/versions/Unicode8.0.0/">The Unicode Standard 8.0</a>,
Section 4.5 "General Category" defines a set of character categories.
Go treats all characters in any of the Letter categories Lu, Ll, Lt, Lm, or Lo
as Unicode letters, and those in the Number category Nd as Unicode digits.
</p>

<h3 id="Letters_and_digits">Letters and digits</h3>

<p>

			}
			b[i] = c
		}
		return b
	}
	return Map(unicode.ToLower, s)
}

// ToTitle treats s as UTF-8-encoded bytes and returns a copy with all the Unicode letters mapped to their title case.
func ToTitle(s []byte) []byte { return Map(unicode.ToTitle, s) }

// ToUpperSpecial treats s as UTF-8-encoded bytes and returns a copy with all the Unicode letters mapped to their

	prevCol := in.Stack.Col()
	tok := in.Stack.Next()
	if tok == '\n' || tok == scanner.EOF {
		return nil, nil // No definition for macro
	}
	var args []string
	// The C preprocessor treats
	//	#define A(x)
	// and
	//	#define A (x)
	// distinctly: the first is a macro with arguments, the second without.
	// Distinguish these cases using the column number, since we don't

</pre>

<p>
In <a href="https://www.unicode.org/versions/Unicode8.0.0/">The Unicode Standard 8.0</a>,
Section 4.5 "General Category" defines a set of character categories.
Go treats all characters in any of the Letter categories Lu, Ll, Lt, Lm, or Lo
as Unicode letters, and those in the Number category Nd as Unicode digits.
</p>

<h3 id="Letters_and_digits">Letters and digits</h3>

<p>

pkg syscall, const SIGTERM = 15
pkg syscall, const SIGTRAP = 5
pkg syscall, const SOCK_DGRAM = 2
pkg syscall, const SOCK_RAW = 3
pkg syscall, const SOCK_SEQPACKET = 5
pkg syscall, const SOCK_STREAM = 1
pkg syscall, const S_IFBLK = 24576
pkg syscall, const S_IFCHR = 8192
pkg syscall, const S_IFDIR = 16384
pkg syscall, const S_IFIFO = 4096
pkg syscall, const S_IFLNK = 40960

// the text of the most recently returned token is, and where it was found.
// The underlying scanner elides all spaces except newline, so the input looks like a stream of
// Tokens; original spacing is lost but we don't need it.
type TokenReader interface {
	// Next returns the next token.
	Next() ScanToken
	// The following methods all refer to the most recent token returned by Next.

pkg syscall (windows-386), const XP1_PARTIAL_MESSAGE = 262144
pkg syscall (windows-386), const XP1_PARTIAL_MESSAGE ideal-int
pkg syscall (windows-386), const XP1_PSEUDO_STREAM = 16
pkg syscall (windows-386), const XP1_PSEUDO_STREAM ideal-int
pkg syscall (windows-386), const XP1_QOS_SUPPORTED = 8192
pkg syscall (windows-386), const XP1_QOS_SUPPORTED ideal-int
pkg syscall (windows-386), const XP1_SAN_SUPPORT_SDP = 524288

	magicUSTAR, versionUSTAR = "ustar\x00", "00"
	trailerSTAR              = "tar\x00"
)

// Size constants from various tar specifications.
const (
	blockSize  = 512 // Size of each block in a tar stream
	nameSize   = 100 // Max length of the name field in USTAR format
	prefixSize = 155 // Max length of the prefix field in USTAR format

	// Max length of a special file (PAX header, GNU long name or link).

	}

	data1, data2, pax, sparse := ss[0], ss[1], ss[2], ss[3]
	data2 += strings.Repeat("\x00", 10*512)
	trash := strings.Repeat("garbage ", 64) // Exactly 512 bytes

	vectors := []struct {
		input string // Input stream
		cnt   int    // Expected number of headers read
		err   error  // Expected error outcome
	}{
		{"", 0, io.EOF}, // Empty file is a "valid" tar file
		{data1[:511], 0, io.ErrUnexpectedEOF},

to say `go` `1.21`, the program can opt back into the old `panic(nil)`
behavior by including this directive:

	//go:debug panicnil=1

Starting in Go 1.21, the Go toolchain treats a `//go:debug` directive
with an unrecognized GODEBUG setting as an invalid program.
Programs with more than one `//go:debug` line for a given setting
are also treated as invalid.