// NOTE: we don't immediately check the error, because the failure could be either because
	// the runner failed for some unexpected reason, or because a test case failed, and we
	// cannot easily differentiate these cases. We check if the JSON results file was written,
	// which should only happen if the failure was because of a test failure, and use that
	// to determine the failure mode.

	resultsJSON, jsonErr := os.ReadFile(resultsFile)

		stringslite.HasSuffix(err.Error(), "dns: resource does not exist; negrcode 0") ||
		stringslite.HasSuffix(err.Error(), "dns: resource does not exist; negrcode") ||
		stringslite.HasSuffix(err.Error(), "dns failure") {
		err = errNoSuchHost
	}
	return newDNSError(err, name, "")
}

// toLower returns a lower-case version of in. Restricting us to
// ASCII is sufficient to handle the IP protocol names and allow

	t.Helper()
	if nerr, ok := err.(net.Error); ok {
		if !nerr.Timeout() {
			if runtime.GOOS == "windows" && runtime.GOARCH == "arm64" && t.Name() == "TestTestConn/TCP/RacyRead" {
				t.Logf("ignoring known failure mode on windows/arm64; see https://go.dev/issue/52893")
			} else {
				t.Errorf("got error: %v, want err.Timeout() = true", nerr)
			}
		}
	} else {
		t.Errorf("got %T: %v, want net.Error", err, err)
	}
}

	{26, "SIGVTALRM", "virtual timer expired"},
	{27, "SIGPROF", "profiling timer expired"},
	{28, "SIGWINCH", "window changed"},
	{29, "SIGIO", "I/O possible"},
	{30, "SIGPWR", "power failure"},
	{31, "SIGSYS", "bad system call"},

	{26, "SIGVTALRM", "virtual timer expired"},
	{27, "SIGPROF", "profiling timer expired"},
	{28, "SIGWINCH", "window changed"},
	{29, "SIGIO", "I/O possible"},
	{30, "SIGPWR", "power failure"},
	{31, "SIGSYS", "bad system call"},

		if cls := runtime.GCTestPointerClass(unsafe.Pointer(new)); cls != "stack" {
			t.Fatalf("test bug: new (%#x) should be a stack pointer, not %s", new2, cls)
		}
		// This was a real failure.
		return false
	}
	return true
}

func TestGCTestMoveStackRepeatedly(t *testing.T) {
	// Move the stack repeatedly to make sure we're not doubling
	// it each time.
	for i := 0; i < 100; i++ {

	unificationDepthLimit = 50

	// Whether to panic when unificationDepthLimit is reached.
	// If disabled, a recursion depth overflow results in a (quiet)
	// unification failure.
	panicAtUnificationDepthLimit = true

	// If enableCoreTypeUnification is set, unification will consider
	// the core types, if any, of non-local (unbound) type parameters.
	enableCoreTypeUnification = true

	ip, err := ParseAddr(s)
	if err != nil {
		panic(err)
	}
	return ip
}

type parseAddrError struct {
	in  string // the string given to ParseAddr
	msg string // an explanation of the parse failure
	at  string // optionally, the unparsed portion of in at which the error occurred.
}

func (err parseAddrError) Error() string {
	q := strconv.Quote
	if err.at != "" {

	unificationDepthLimit = 50

	// Whether to panic when unificationDepthLimit is reached.
	// If disabled, a recursion depth overflow results in a (quiet)
	// unification failure.
	panicAtUnificationDepthLimit = true

	// If enableCoreTypeUnification is set, unification will consider
	// the core types, if any, of non-local (unbound) type parameters.
	enableCoreTypeUnification = true

	{26, "SIGVTALRM", "virtual timer expired"},
	{27, "SIGPROF", "profiling timer expired"},
	{28, "SIGWINCH", "window changed"},
	{29, "SIGIO", "I/O possible"},
	{30, "SIGPWR", "power failure"},
	{31, "SIGSYS", "bad system call"},