title: emoji cannot be a literal and what else?
body: <blockquote>
    <p>A literal is the source code representation of a value of a type, such as a number or string</p>
  </blockquote>
  
  <p>There are 3 kinds of literals in Swift: <strong>Integer Literals</strong>, <strong>Floating-Point Literals</strong> and <strong>String Literals</strong> (please correct me if I'm wrong), Is that means (<strong>My Guess</strong>) any elements which not belong to a type of Integer, Floating or String is not considered as a literal, and will trigger an error when used as literals </p>
  
  <p>According to what I guess I've tried this <code>let aEmoji = </code></p>
  
  <p><a href="https://i.stack.imgur.com/AlBp7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AlBp7.png" alt="enter image description here"></a></p>
  
  <p><strong>Question1:</strong> Is my guess accurate? If not, I appreciate you could correct me.</p>
  
  <p><strong>Question2:</strong> Is there anything else shouldn't use as a literal? (would be nice you could give me some example)</p>
  
  <p>Thanks</p>