assertNoneType(new NRepr(null));
assertNoneType(new NReturn(null));
assertNoneType(new NSlice(null, null, null));
assertNoneType(new NStr());
assertNoneType(new NSubscript(null, null));
assertNoneType(new NTryExcept(null, null, null));
assertNoneType(new NTryFinally(null, null));
assertNoneType(new NTuple(null));
assertNoneType(new NUnaryOp(null, null));
assertNoneType(new NUrl(""));
assertNoneType(new NWhile(null, null, null));