title: How to enable library evolution?
body: <p>I maintain a small library in Swift. I read the great article from Ben Cohen about <a href="https://forums.swift.org/t/pitch-library-evolution-for-stable-abis/23026" rel="nofollow noreferrer">evolution for Stable ABIs</a>. To enable library evolution mode, I have to add a new command-line argument <code>-enable-library-evolution</code>. </p>
  
  <p>My problem is, that even after I add <code>-enable-library-evolution</code> argument to <code>Arguments passed On Launch</code> in my scheme settings, I still have this weird warning from Xcode:</p>
  
  <blockquote>
    <p>@frozen has no effect without -enable-library-evolution. Replace '@frozen ' with ''</p>
  </blockquote>
  
  <p>Am I doing something wrong?</p>