svoid test_ParameterizedTypeImpl() {
  class X { LS bla; }
  Type a = genericFieldType(X.class, "bla");
  Type b = ParameterizedTypeImpl(null, L.class, S.class);
  assertEqualsBothDirectionsVerbose(a, b);
  b = ParameterizedTypeImpl(null, L.class, L.class);
  assertNotEqualsBothDirectionsVerbose(a, b);
  b = ParameterizedTypeImpl(null, Optional.class, S.class);
  assertNotEqualsBothDirectionsVerbose(a, b);
}