title: import 'kotlinx.android.synthetic' does not work
body: <p>I have a project mainly written in Java, and I just need Kotlin for a few fragments. </p>
  
  <p>And, I noticed that the import 'kotlinx.android.synthetic' does not work.</p>
  
  <p>How to allow this import (for a project 99% written in Java) ?</p>