Calling consturctor of superclass from constructor's body of subclass in Dart

Question

I am a beginner in Dart. :-)

I wonder why I can't call the parent class constructor inside the child class constructor body.

class Parent {
  String? name;

  Parent(this.name);
  Parent.namedConstructor(this.name);
}

class Child extends Parent {
  // Child(String name) : super(name); // It's OK
  // Child(String name) : super.namedConstructor(name); // It's OK, too.

  Child(String name) {
    super(name); // Error
    super.namedConstructor(name); // Error
  }
}