kwalrath · December 17, 2019 19:28
diff --git a/variance_motivation_solution.dart b/variance_motivation_solution.dart
 // Add a contravariant variance modifier
 class Writer<in T> {  
  void write(T x) => print(x);
 }

 main() {
  // Error! Cannot assign Writer<int> to Writer<Object> because the type
  // parameter is contravariantly declared.
  Writer<Object> objectWriter = new Writer<int>(); 
 }
	// Add a contravariant variance modifier
	class Writer<in T> {
	void write(T x) => print(x);
	}

	main() {
	// Error! Cannot assign Writer<int> to Writer<Object> because the type
	// parameter is contravariantly declared.
	Writer<Object> objectWriter = new Writer<int>();
	}