var wg sync.WaitGroup
	for i := 0; i < 5; i++ {
		wg.Add(1)
		go func(i int) {
			defer wg.Done()
			var buf [1]byte
			r.ReadAt(buf[:], int64(i))
		}(i)
	}
	wg.Wait()
}

func TestEmptyReaderConcurrent(t *testing.T) {
	// Test for the race detector, to verify a Read that doesn't yield any bytes
	// is okay to use from multiple goroutines. This was our historic behavior.

	CLDEMOTE BX                      // ERROR "invalid instruction"
	// WAITPKG instructions:
	TPAUSE (BX)                      // ERROR "invalid instruction"
	UMONITOR (BX)                    // ERROR "invalid instruction"
	UMWAIT (BX)                      // ERROR "invalid instruction"
	// .Z instructions
	VMOVDQA32.Z Z0, Z1               // ERROR "mask register must be specified for .Z instructions"

pkg syscall (windows-386), const USAGE_MATCH_TYPE_OR = 1
pkg syscall (windows-386), const WAIT_ABANDONED = 128
pkg syscall (windows-386), const WAIT_FAILED = 4294967295
pkg syscall (windows-386), const WAIT_OBJECT_0 = 0
pkg syscall (windows-386), const WAIT_TIMEOUT = 258
pkg syscall (windows-386), const WSADESCRIPTION_LEN = 256
pkg syscall (windows-386), const WSASYS_STATUS_LEN = 128

immediately, yielding the element type's <a href="#The_zero_value">zero value</a>
after any previously sent values have been received.
</p>

<pre>
v1 := &lt;-ch
v2 = &lt;-ch
f(&lt;-ch)
&lt;-strobe  // wait until clock pulse and discard received value
</pre>

<p>
A receive expression used in an <a href="#Assignment_statements">assignment statement</a> or initialization of the special form
</p>

<pre>

Asia/Hong_Kong Asia/Hovd Asia/Irkutsk Asia/Istanbul Asia/Jakarta Asia/Jayapura Asia/Jerusalem Asia/Kabul Asia/Kamchatka Asia/Karachi Asia/Kashgar Asia/Kathmandu Asia/Katmandu Asia/Khandyga Asia/Kolkata Asia/Krasnoyarsk Asia/Kuala_Lumpur Asia/Kuching Asia/Kuwait Asia/Macao Asia/Macau Asia/Magadan Asia/Makassar Asia/Manila Asia/Muscat Asia/Nicosia Asia/Novokuznetsk Asia/Novosibirsk Asia/Omsk Asia/Oral Asia/Phnom_Penh Asia/Pontianak Asia/Pyongyang Asia/Qatar Asia/Qostanay Asia/Qyzylorda Asia/Rangoon Asia/Riyadh...

			log.Printf(" url %s has #%s", url, id)
		}
		fragExists[urlFrag{url, id}] = true
	}
	return nil
}

func main() {
	flag.Parse()

	go crawlLoop()
	crawl(*root, "")

	wg.Wait()
	close(urlq)
	for uf, needers := range neededFrags {
		if !fragExists[uf] {
			problems = append(problems, fmt.Sprintf("Missing fragment for %+v from %v", uf, needers))
		}
	}

pkg syscall (freebsd-riscv64), const SYS_KSEM_UNLINK = 406 #53466
pkg syscall (freebsd-riscv64), const SYS_KSEM_UNLINK ideal-int #53466
pkg syscall (freebsd-riscv64), const SYS_KSEM_WAIT = 402 #53466
pkg syscall (freebsd-riscv64), const SYS_KSEM_WAIT ideal-int #53466
pkg syscall (freebsd-riscv64), const SYS_KTIMER_CREATE = 235 #53466
pkg syscall (freebsd-riscv64), const SYS_KTIMER_CREATE ideal-int #53466

				time.Sleep(time.Millisecond)
				continue
			}

			t.Error(err)
			return
		}
		cmds = append(cmds, cmd)
	}

	failures := 0
	for _, cmd := range cmds {
		err := cmd.Wait()
		if err == nil {
			continue
		}

		t.Errorf("syscall.Exec failed: %v\n%s", err, cmd.Stdout)
		failures++
	}

	if failures > 0 {
		t.Logf("Failed %v of %v attempts.", failures, len(cmds))

	for _, context := range contexts {
		context := context
		wg.Add(1)
		go func() {
			defer wg.Done()
			_ = NewWalker(context, filepath.Join(testenv.GOROOT(nil), "src"))
		}()
	}
	wg.Wait()
})

func TestIssue21181(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping with -short")
	}
	if *flagCheck {
		// slow, not worth repeating in -check
		t.Skip("skipping with -check set")

				throw new Error("total length of command line and environment variables exceeds limit");
			}

			this._inst.exports.run(argc, argv);
			if (this.exited) {
				this._resolveExitPromise();
			}
			await this._exitPromise;
		}

		_resume() {
			if (this.exited) {
				throw new Error("Go program has already exited");
			}
			this._inst.exports.resume();
			if (this.exited) {