main.dart

import 'dart:math' as math;

// Poorly named wrapper for math.Random
class Random {
  math.Random inner;

  Random(this.inner);
}

void main() {
  List<Random> list = new List<Random>()..add(new Random(new math.Random(7)));
  addRandom(list.map((e) => e.inner));
}

addRandom(List<math.Random> list) => list..add(new math.Random());