title: Intellij IDEA appends and unerscore to the "expecpted" type name, why?
body: <p>This happens to me <em>a lot</em> so maybe something is wrong with my settings or something but perhaps there is another explanation ?
  Problem is : what is the <code>Gen[A_]</code> type? specially what is the <code>A_</code> (notice the extra underscore) ? </p>
  
  <p><a href="https://i.stack.imgur.com/TgkrA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TgkrA.png" alt="problem"></a></p>