Flutter: neu

Container.dart

// flutter:widgets/container.dart
// in Container
// ...

@override
Widget build(BuildContext context) {
  Widget current = child;
  
  if (decoration != null) {
    current = DecoratedBox(...);
  }
  
  if (constraints != null) {
    current = ConstrainedBox(...);
  }
  
  // ...
  // More code
  // ...
  
  return current;
}

// ...