Reports an assignment expression that is nested inside another expression.

Such expressions may be confusing and violate the general design principle, which states that any construct should do precisely one thing.

Example:


  String userName;
  // Warning: result of assignment to 'userName' is used
  String message = "Hello " + (userName = "Alice") + "!"
  System.out.println(message);
  System.out.println("Goodbye " + userName);