abstract <X> void acceptX(X x);

    abstract <T2 extends Enum<T2> & CharSequence> T2 returningT2();

    abstract <T2 extends CharSequence & Iterable<T2>> void acceptT2(T2 t2);

    static void verifyConsistentRawType() {
      for (Method method : RawTypeConsistencyTester.class.getDeclaredMethods()) {
        assertEquals(
            method.getReturnType(), TypeToken.of(method.getGenericReturnType()).getRawType());