Sound Dart Guide: unsound example

main.dart

// The code passes static non-strong mode static analysis.
// Enable strong mode by clicking Strong mode checkbox in lower right.
// The code now raises a warning.

void fn(List<int> a) {
  print(a);
}

main() {
  var list = [];  // Add <int> before the [] to pass strong mode
  list.add(1);
  list.add(2);
  fn(list);
}