assertNoneType(new NListComp(null, null));
assertNoneType(new NModule(null, 0, 1));
assertNoneType(new NName(""));
assertNoneType(new NNum(-1));
assertNoneType(new NPass());
assertNoneType(new NPlaceHolder());
assertNoneType(new NPrint(null, null));
assertNoneType(new NQname(null, new NName("")));
assertNoneType(new NRaise(null, null, null));
assertNoneType(new NRepr(null));
assertNoneType(new NReturn(null));