// untyped operand to the type of the other.
	// If mayConvert returns true, we try to convert the
	// operands to each other's types, and if that fails
	// we report a conversion failure.
	// If mayConvert returns false, we continue without an
	// attempt at conversion, and if the operand types are
	// not compatible, we report a type mismatch error.
	mayConvert := func(x, y *operand) bool {

		t.Errorf("with redirects forbidden, expected a *url.Error with our 'no redirects allowed' error inside; got %#v (%q)", err, err)
	}
	if res == nil {
		t.Fatalf("Expected a non-nil Response on CheckRedirect failure (https://golang.org/issue/3795)")
	}
	res.Body.Close()
	if res.Header.Get("Location") == "" {
		t.Errorf("no Location header in Response")
	}
}

	// and reinvoking the current binary.
	// The special cases =loop and =mismatch skip the
	// setting of TESTGO_VERSION so that it looks like we
	// accidentally invoked the wrong toolchain,
	// to test detection of that failure mode.
	switch TestVersionSwitch {
	case "switch":
		os.Setenv("TESTGO_VERSION", gotoolchain)
		fallthrough
	case "loop", "mismatch":
		exe, err := os.Executable()
		if err != nil {

			}
			return nil
		}); err != nil {
			// Internal errors are marked with f.Fail; user code may call this too, before F.Fuzz.
			// The worker will exit with fuzzWorkerExitCode, indicating this is a failure
			// (and 'go test' should exit non-zero) but a failing input should not be recorded.
			f.Errorf("communicating with fuzzing coordinator: %v", err)
		}

	default:

	if gp.m.p != 0 {
		// Call on the systemstack to avoid a nosplit overflow build failure
		// on some platforms when built with -N -l. See #64113.
		systemstack(func() {
			throw("wirep: already in go")
		})
	}
	if pp.m != 0 || pp.status != _Pidle {
		// Call on the systemstack to avoid a nosplit overflow build failure
		// on some platforms when built with -N -l. See #64113.
		systemstack(func() {

						if !m.IsLiteral() && (err == errPkgIsBuiltin || err == errPkgIsGorootSrc) {
							continue // Don't include "builtin" or GOROOT/src in wildcard patterns.
						}

						// If we're outside of a module, ensure that the failure mode
						// indicates that.
						if !HasModRoot() {
							die()
						}

						if ld != nil {
							m.AddError(err)
						}
						continue
					}
					m.Pkgs = append(m.Pkgs, pkg)

	if err != nil {
		t.Fatal(err)
	}
	lnf, err := ln.(*net.TCPListener).File()
	if err != nil {
		t.Fatal(err)
	}
	defer ln.Close()

	// Attempt to run strace, and skip on failure - this test requires SYS_PTRACE.
	if err := testenv.Command(t, "strace", "-f", "-q", os.Args[0], "-test.run=^$").Run(); err != nil {
		t.Skipf("skipping; failed to run strace: %v", err)
	}

// digits after the decimal and the separator character (period or comma).
// These functions pack and unpack that variable.
func stdFracSecond(code, n, c int) int {
	// Use 0xfff to make the failure case even more absurd.
	if c == '.' {
		return code | ((n & 0xfff) << stdArgShift)
	}
	return code | ((n & 0xfff) << stdArgShift) | 1<<stdSeparatorShift
}

func digitsLen(std int) int {

				if retry == 0 {
					t.vlogf("RoundTrip retrying after failure: %v", roundTripErr)
					continue
				}
				backoff := float64(uint(1) << (uint(retry) - 1))
				backoff += backoff * (0.1 * mathrand.Float64())
				d := time.Second * time.Duration(backoff)
				tm := t.newTimer(d)
				select {
				case <-tm.C():
					t.vlogf("RoundTrip retrying after failure: %v", roundTripErr)
					continue

}

// doGrep looks for a regular expression in a buffer and fails if it
// is not found. The name argument is the name of the output we are
// searching, "output" or "error". The msg argument is logged on
// failure.
func (tg *testgoData) doGrep(match string, b *bytes.Buffer, name, msg string) {
	tg.t.Helper()
	if !tg.doGrepMatch(match, b) {
		tg.t.Log(msg)
		tg.t.Logf("pattern %v not found in standard %s", match, name)