if err != nil {
		t.Errorf("got error scanning %q: %s", text, err)
	}
	if n != 3 {
		t.Errorf("count error scanning %q: got %d", text, n)
	}
	if !math.IsNaN(float64(f)) || !math.IsNaN(float64(f32)) || !math.IsNaN(f64) {
		t.Errorf("didn't get NaNs scanning %q: got %g %g %g", text, f, f32, f64)
	}
}

func TestNaN(t *testing.T) {
	for _, s := range []string{"nan", "NAN", "NaN"} {

	if fn {
		return nan64
	}
	fs64 := uint64(fs) << 32
	if fi {
		return fs64 ^ inf64
	}
	return fpack64(fs64, uint64(fm)<<d, fe, 0)
}

func fcmp64(f, g uint64) (cmp int32, isnan bool) {
	fs, fm, _, fi, fn := funpack64(f)
	gs, gm, _, gi, gn := funpack64(g)

	switch {
	case fn, gn: // flag NaN
		return 0, true

	case !fi && !gi && fm == 0 && gm == 0: // ±0 == ±0

        auto cur_error = std::fabs(jac_t(r, c) - jac_n(r, c));
        // Treat any NaN as max_error and immediately return.
        // (Note that std::max may ignore NaN arguments.)
        if (std::isnan(cur_error)) {
          *max_error = cur_error;
          return absl::OkStatus();
        }
        *max_error = std::max(*max_error, cur_error);
      }
    }
  }
  return absl::OkStatus();
}

   * @throws IllegalArgumentException if {@code permitsPerSecond} is negative or zero
   */
  public final void setRate(double permitsPerSecond) {
    checkArgument(
        permitsPerSecond > 0.0 && !Double.isNaN(permitsPerSecond), "rate must be positive");
    synchronized (mutex()) {
      doSetRate(permitsPerSecond, stopwatch.readMicros());
    }
  }

  abstract void doSetRate(double permitsPerSecond, long nowMicros);

	"1152921504606846977",  //   1<<60 + 1
	"-1152921504606846977", // -(1<<60 + 1)

	"1/3",
}

// isFinite reports whether f represents a finite rational value.
// It is equivalent to !math.IsNan(f) && !math.IsInf(f, 0).
func isFinite(f float64) bool {
	return math.Abs(f) <= math.MaxFloat64
}

func TestFloat32SpecialCases(t *testing.T) {
	for _, input := range float64inputs {

(I64Or  (I64Const [x]) (I64Const [y])) => (I64Const [x | y])
(I64Xor (I64Const [x]) (I64Const [y])) => (I64Const [x ^ y])
(F64Add (F64Const [x]) (F64Const [y])) => (F64Const [x + y])
(F64Mul (F64Const [x]) (F64Const [y])) && !math.IsNaN(x * y) => (F64Const [x * y])
(I64Eq  (I64Const [x]) (I64Const [y])) && x == y => (I64Const [1])
(I64Eq  (I64Const [x]) (I64Const [y])) && x != y => (I64Const [0])
(I64Ne  (I64Const [x]) (I64Const [y])) && x == y => (I64Const [0])

  }

  function nodeId(elem) {
    const id = elem.id;
    if (!id) return -1;
    if (!id.startsWith('node')) return -1;
    const n = parseInt(id.slice(4), 10);
    if (isNaN(n)) return -1;
    if (n < 0 || n >= nodes.length) return -1;
    return n;
  }

  // Change highlighting of node (returns true if node was found).
  function setNodeHighlight(n, set) {

            8, NaN,
            9, NaN,
            10, NaN);
  }

  public void testScale_index_compute_doubleCollection_nan() {
    assertThat(Quantiles.scale(10).index(5).compute(ONE_TO_FIVE_AND_NAN)).isNaN();
  }

  // 3. Tests on a mechanically generated dataset for chains starting with percentiles():

  private static final int PSEUDORANDOM_DATASET_SIZE = 9951;

	nan := math.NaN()
	for i := 0; i < n; i++ {
		m[nan] = 1
	}
	if len(m) != n {
		panic("wrong size map after nan insertion")
	}
	iters := 0
	for k, v := range m {
		iters++
		if !math.IsNaN(k) {
			panic("not NaN")
		}
		if v != 1 {
			panic("wrong value")
		}
	}
	if iters != n {
		panic("wrong number of nan range iters")
	}

---

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