assertThat(actualSubtype.getActualTypeArguments()[0]).isInstanceOf(WildcardType.class);
  }

  public <T> void testGetSubtype_manyGenericArgs() {
    class FourTypeArgs<T1, T2, T3, T4> {}
    class ThreeTypeArgs<T1, T2, T3> extends FourTypeArgs<T1, T2, T3, String> {}
    TypeToken<FourTypeArgs<T, Integer, ?, ?>> supertype =
        new TypeToken<FourTypeArgs<T, Integer, ?, ?>>() {};
    TypeToken<ThreeTypeArgs<T, Integer, String>> subtype =

// invalid array types
type (
	T1 [10]T1                 // element type of T1 is T1
	T2 [10]struct{ f T2 }     // T2 contains T2 as component of a struct
	T3 [10]T4                 // T3 contains T3 as component of a struct in T4
	T4 struct{ f T3 }         // T4 contains T4 as component of array T3 in a struct
)

// valid array types
type (
	T5 [10]*T5                // T5 contains T5 as component of a pointer

	{"", []string{}},
	{" ", []string{}},
	{" \t ", []string{}},
	{"  abc  ", []string{"abc"}},
	{"1 2 3 4", []string{"1", "2", "3", "4"}},
	{"1  2  3  4", []string{"1", "2", "3", "4"}},
	{"1\t\t2\t\t3\t4", []string{"1", "2", "3", "4"}},
	{"1\u20002\u20013\u20024", []string{"1", "2", "3", "4"}},
	{"\u2000\u2001\u2002", []string{}},
	{"\n™\t™\n", []string{"™", "™"}},
	{faces, []string{faces}},
}