title: using for comprehension for 2-argument map function
body: <p>I've tried to use zipped method for tuple to browse temporary zipped list</p>
  
  <p>give it be something like it:</p>
  
  <pre><code>val l1 : List[Int] = List(1,2,3)
  val l2 : List[Int] = List(2,3,1)
  val l3 : List[Int] = for ( (a,b) &lt;- (l1,l2).zipped ) yield a+b
  </code></pre>
  
  <p>It is a synthetic example and may be replaced with just map function, but I want to use it in more complicated for expressions.</p>
  
  <p>It gives me error:  <em>wrong number of parameters; expected = 2</em> which make sense since (l1,l2).zipped.map has two arguments. What is the right way to translate two-argument map function inside for comprehension?</p>