errCannotUnmarshalDNSMessage = errors.New("cannot unmarshal DNS message")
	errCannotMarshalDNSMessage   = errors.New("cannot marshal DNS message")
	errServerMisbehaving         = errors.New("server misbehaving")
	errInvalidDNSResponse        = errors.New("invalid DNS response")
	errNoAnswerFromDNSServer     = errors.New("no answer from DNS server")

	// errServerTemporarilyMisbehaving is like errServerMisbehaving, except

func checkDNSLookupFailed() echo.Checker {
	return check.And(
		check.Error(),
		func(_ echo.CallResult, err error) error {
			if strings.Contains(err.Error(), "no such host") || strings.Contains(err.Error(), "server misbehaving") {
				return nil
			}
			return err
		})
}

func callAndValidate(t framework.TestContext, ht hostType, from echo.Instance, to echo.Target, checker echo.Checker) {
	t.Helper()

			r.Header.RCode = dnsmessage.RCodeNameError
		}

		return r, nil
	}}

	cases := []struct {
		strictErrors bool
		wantErr      *DNSError
	}{
		{true, &DNSError{Name: fqdn, Err: "server misbehaving", IsTemporary: true}},
		{false, &DNSError{Name: fqdn, Err: errNoSuchHost.Error(), IsNotFound: true}},
	}
	for _, tt := range cases {
		r := Resolver{PreferGo: true, StrictErrors: tt.strictErrors, Dial: fake.DialContext}

    assertThat(
            new AbstractFuture<Object>() {
              @Override
              public String pendingToString() {
                throw new RuntimeException("I'm a misbehaving implementation");
              }
            }.toString())
        .matches(
            "[^\\[]+\\[status=PENDING, info=\\[Exception thrown from implementation: "

    assertThat(
            new AbstractFuture<Object>() {
              @Override
              public String pendingToString() {
                throw new RuntimeException("I'm a misbehaving implementation");
              }
            }.toString())
        .matches(
            "[^\\[]+\\[status=PENDING, info=\\[Exception thrown from implementation: "

// its own defers (d4 and d3), so drangefunc need not be at the
// top of the list when deferprocat is used. This is why we pass
// the atomic head explicitly.
//
// To keep misbehaving programs from crashing the runtime,
// deferprocat pushes new defers onto the .head list atomically.
// The fact that it is a separate list from the main goroutine
// defer list means that the main goroutine's defers can still

	f.Offset = p.Offset

	// NOTE(rsc): This is the only allocation in the interface
	// presented by a reflect.Type. It would be nice to avoid,
	// at least in the common cases, but we need to make sure
	// that misbehaving clients of reflect cannot affect other
	// uses of reflect. One possibility is CL 5371098, but we
	// postponed that ugliness until there is a demonstrated
	// need for the performance. This is issue 2320.

	//
	// Unfortunately, we have no straightforward way to be “reasonably certain”
	// that we have received the client's ACK, and at any rate we don't want to
	// allow a misbehaving client to soak up server connections indefinitely by
	// withholding an ACK, nor do we want to go through the complexity or overhead
	// of using low-level APIs to figure out when a TCP round-trip has completed.
	//