print("\n--- Test: Basic Class (no init, no this) ---");

class Foo {
  var x;
  func ping() { print("ping"); }
}

var a = Foo();
a.ping();

// Field default should be none
assert(type(a.x) == "none", "default field value should be none");

// Property assignment on instance
a.x = 42;
assert(a.x == 42, "instance property set/get should work");

print("Basic class: PASS");