Nested object pattern about language

[eernstg]

Sure. With a couple of adjustments, it runs:

class Company {
  Localizations localizations;
  String facility;
  Company({required this.localizations, required this.facility});
}

class Localizations {
  String map;
  Localizations(this.map);
}

void main() {
  late Company company =
      Company(localizations: Localizations('map'), facility: 'facility');
  final Company(:facility, localizations: Localizations(:map)) = company;
}