Abstract ancestor property accessors not resolving properly

[rich-j]

Virtual references in multi-level ancestors are not resolving properly. A simplified example of the issue happens with 3 levels of inheritance with declaration at the first level, reference at the second and definition at the third.

abstract class Base {
  String get id;
}

abstract class Enhanced extends Base {
  //String get id;      // <-- uncomment this and equality will work
  operator ==(other) => other is Enhanced && id == other.id;
}

class Obj extends Enhanced {
  String id = "id1";
}

Running the test case:

test("Equality test", (){
  final obj = new Obj();
  expect(obj, obj);
});

Results in a test failure because the equality check for obj fails. Add a declaration for id in the second level (the commented line in class Enhanced) and the equality check succeeds.

Dart VM version: 2.0.0-dev.60.0 (Mon Jun 4 22:09:13 2018 +0200) on "macos_x64"

Run with command pub run build_runner test -- -p chrome