interface FunctionAC {
  String apply(String s);
}

public class AssignmentContext {
  // Test assign
  FunctionAC f1 = String::toString;

  // Test casts
  Object o1 = (Object) (FunctionAC) String::toString;

  void take(FunctionAC f) {
    // Test argument assingment
    take(String::toString);
  }

  FunctionAC supply() {
    // Test return assingment
    return String::toString;
  }
}