title: Trying to use Tagged template strings gives 'Uncaught SyntaxError: Unexpected token'
body: <p>I'm using tagged template strings in following code</p>
  
  <pre><code>var a = 5;
  var b = 10;
  var pp="";
  function tag(strings, ...values) {
    pp+=strings[0]; // "Hello "
    pp+=strings[1]; // " world "
    pp+=values[0];  // 15
    pp+=values[1];  // 50
  
    console.log(pp+"Bazinga!");
  }
  
  tag`Hello ${ a + b } world ${ a * b}`;
  </code></pre>
  
  <p>but it gives </p>
  
  <blockquote>
    <p>Uncaught SyntaxError: Unexpected token ...(…)</p>
  </blockquote>
  
  <p>On <code>function tag(strings, ...values) {</code></p>