title: Scala 2.12.2 emits a ton of useless "Warning: parameter value ... in method ... is never used" warnings. How to get rid of them?
body: <p>This is a question so I don't have to traverse the entire Internet to find the answer, as scalac options are currently not published.</p>
  
  <p>How do I disable these warnings starting in Scala 2.12.2, when I have a global <code>"-Xlint"</code>?</p>