Suppose a function <code>G</code> defers a function <code>D</code> that calls
<code>recover</code> and a panic occurs in a function on the same goroutine in which <code>G</code>
is executing.
When the running of deferred functions reaches <code>D</code>,
the return value of <code>D</code>'s call to <code>recover</code> will be the value passed to the call of <code>panic</code>.
If <code>D</code> returns normally, without starting a new

	"strings"
	"sync"
)

var (
	root    = flag.String("root", "http://localhost:6060", "Root to crawl")
	verbose = flag.Bool("verbose", false, "verbose")
)

var wg sync.WaitGroup        // outstanding fetches
var urlq = make(chan string) // URLs to crawl

// urlFrag is a URL and its optional #fragment (without the #)
type urlFrag struct {
	url, frag string
}

var (
	mu          sync.Mutex

	onComma := func(data []byte, atEOF bool) (advance int, token []byte, err error) {
		i := bytes.IndexByte(data, ',')
		if i == -1 {
			if !atEOF {
				return 0, nil, nil
			}
			// If we have reached the end, return the last token.
			return 0, data, bufio.ErrFinalToken
		}
		// If the token is "STOP", stop the scanning and ignore the rest.
		if string(data[:i]) == "STOP" {
			return i + 1, nil, bufio.ErrFinalToken

					}
					break
				}
			}
		}

		buildStrings()
		return d, ints, floats, strs
	}
	fatalf("cannot parse gcc output %s as ELF, Mach-O, PE, XCOFF object", gccTmp())
	panic("not reached")
}

// gccDefines runs gcc -E -dM -xc - over the C program stdin
// and returns the corresponding standard output, which is the
// #defines that gcc encountered while processing the input

pkg syscall (darwin-arm64), const DT_WHT = 14
pkg syscall (darwin-arm64), const DT_WHT ideal-int
pkg syscall (darwin-arm64), const E2BIG = 7
pkg syscall (darwin-arm64), const EACCES = 13
pkg syscall (darwin-arm64), const EADDRINUSE = 48
pkg syscall (darwin-arm64), const EADDRNOTAVAIL = 49
pkg syscall (darwin-arm64), const EAFNOSUPPORT = 47
pkg syscall (darwin-arm64), const EAGAIN = 35

pkg syscall (freebsd-arm64), const DT_WHT = 14
pkg syscall (freebsd-arm64), const DT_WHT ideal-int
pkg syscall (freebsd-arm64), const E2BIG = 7
pkg syscall (freebsd-arm64), const EACCES = 13
pkg syscall (freebsd-arm64), const EADDRINUSE = 48
pkg syscall (freebsd-arm64), const EADDRNOTAVAIL = 49
pkg syscall (freebsd-arm64), const EAFNOSUPPORT = 47
pkg syscall (freebsd-arm64), const EAGAIN = 35

	// is too large we are basically just thrashing the CPU D-cache.
	// So if the result length is larger than an empirically-found
	// limit (8KB), we stop growing the source string once the limit
	// is reached and keep reusing the same source string - that
	// should therefore be always resident in the L1 cache - until we
	// have completed the construction of the result.
	// This yields significant speedups (up to +100%) in cases where

Suppose a function <code>G</code> defers a function <code>D</code> that calls
<code>recover</code> and a panic occurs in a function on the same goroutine in which <code>G</code>
is executing.
When the running of deferred functions reaches <code>D</code>,
the return value of <code>D</code>'s call to <code>recover</code> will be the value passed to the call of <code>panic</code>.
If <code>D</code> returns normally, without starting a new

pkg syscall (darwin-386), const DT_SOCK = 12
pkg syscall (darwin-386), const DT_UNKNOWN = 0
pkg syscall (darwin-386), const DT_WHT = 14
pkg syscall (darwin-386), const E2BIG = 7
pkg syscall (darwin-386), const EACCES = 13
pkg syscall (darwin-386), const EADDRINUSE = 48
pkg syscall (darwin-386), const EADDRNOTAVAIL = 49
pkg syscall (darwin-386), const EAFNOSUPPORT = 47
pkg syscall (darwin-386), const EAGAIN = 35

		spd = append(spd, sparseEntry{Offset: offset, Length: length})
		sparseMap = sparseMap[2:]
	}
	return spd, nil
}

// Read reads from the current file in the tar archive.
// It returns (0, io.EOF) when it reaches the end of that file,
// until [Next] is called to advance to the next file.
//
// If the current file is sparse, then the regions marked as a hole
// are read back as NUL-bytes.
//