if n != 10 || err != nil {
		t.Fatalf("Write returned (%v, %v), want (10, nil)", n, err)
	}

	// Use ReadFrom to read in some data.
	n2, err := w.ReadFrom(strings.NewReader("abcdef"))
	if n2 != 6 || err != nil {
		t.Fatalf("ReadFrom returned (%v, %v), want (6, nil)", n2, err)
	}
}

type emptyThenNonEmptyReader struct {
	r io.Reader
	n int
}

        TypeToken.of(new TypeCapture<N1>() {}.capture()));
    assertNotAssignable(
        TypeToken.of(new TypeCapture<N2>() {}.capture()),
        TypeToken.of(new TypeCapture<N1>() {}.capture()));
  }

  public <N1 extends Number, N2 extends Number, N11 extends N1>
      void testisSupertypeOf_equalWildcardTypes() {
    assertAssignable(

        TypeToken.of(new TypeCapture<N1>() {}.capture()));
    assertNotAssignable(
        TypeToken.of(new TypeCapture<N2>() {}.capture()),
        TypeToken.of(new TypeCapture<N1>() {}.capture()));
  }

  public <N1 extends Number, N2 extends Number, N11 extends N1>
      void testisSupertypeOf_equalWildcardTypes() {
    assertAssignable(

	{" ", nil},
	{"\u3000 ", nil},
	{" \u3000", nil},
	{" \t\r\n \t\t\r\r\n\n ", nil},
	{" \t\r\n x\t\t\r\r\n\n ", []byte("x")},
	{" \u2000\t\r\n x\t\t\r\r\ny\n \u3000", []byte("x\t\t\r\r\ny")},
	{"1 \t\r\n2", []byte("1 \t\r\n2")},
	{" x\x80", []byte("x\x80")},
	{" x\xc0", []byte("x\xc0")},
	{"x \xc0\xc0 ", []byte("x \xc0\xc0")},
	{"x \xc0", []byte("x \xc0")},
	{"x \xc0 ", []byte("x \xc0")},