retype<K2, V2> method

  1. @override
Map<K2, V2> retype <K2, V2>()

Implementation 

@override
// TODO: Dart 2.0 requires this method to be implemented.
// ignore: override_on_non_overriding_method
Map<K2, V2> retype<K2, V2>() {
  throw new UnimplementedError("retype");
}