unnecessary_overrides does not work for generic methods and null safety mix

[scheglov]

The lint is not reported for:

class A<T> {
  T foo() {
    throw 42;
  }
}

class B extends A<int> {
  @override
  int foo() => super.foo();
}

This is a failing test from analysis server.

  Future<void> test_method_nullSafety_optIn_fromOptOut() async {
    createAnalysisOptionsFile(
      experiments: ['non-nullable'],
      lints: [lintCode],
    );
    newFile('/home/test/lib/a.dart', content: r'''
class A {
  int foo() => 0;
}
''');
    await resolveTestUnit('''
// @dart = 2.7
import 'a.dart';

class B extends A {
  @override
  int foo() => super.foo();
}
''');
    await assertHasFix('''
// @dart = 2.7
import 'a.dart';

class B extends A {
}
''');
  }

[pq]

Thanks! I've got this reproduced and see the problem. 👍