error: An expression whose value can be 'null' must be null-checked before it can be dereferenced - line 9

main.dart

class Foo {
  const Foo({required this.bar});

  final void Function()? bar;

  void doSomething() {
    if (bar != null) {
       // Analyzer still complains that bar can be null.
      bar();
    }
  }
}