Linter: Extend exhaustive_cases to support Classes that are extended

[pasindud]

Describe the rule you'd like to see implemented
I believe currently exhaustive_cases doesn't run if the class extents another class.
I would be nice if somehow it could support when it does. (There might be some complication I am not seeing)

Examples

Following is the way https://github.com/google/built_value.dart works with EnumClasses

class EnumClass {
  final String name;
  const EnumClass(this.name);
  @override
  String toString() => name;
}

class EnumLike extends EnumClass {
  const EnumLike._(String name) : super(name);

  static const a = EnumLike._('A');
  static const b = EnumLike._('B');
  static const c = EnumLike._('C');
}

void bad(EnumLike e) {
  // Enforce exhaustive_cases
  switch(e) {
    case EnumLike.a :
      print('a');
      break;
    case EnumLike.b :
      print('b');
      break;
  }
}

[pq]

Thanks for the report @pasindud!

I just added a test case for this example and it seems to pass with the current implementation... Is it possible that there is more to your EnumLike that's not included above?

[pq]

Ah... is EnumLike _subclassed_ anywhere in your codebase?

[pasindud]

Your right it works perfectly
Thanks for the help

[pq]

You're welcome!