title: How can I enable Flutter/Dart language experiments?
body: <p>I want to use the new <a href="https://medium.com/dartlang/f1ccaf9f546c" rel="noreferrer">spread syntax</a> in Dart.</p>
  
  <p>I'm using Android Studio for Flutter development and I receive this error.</p>
  
  <blockquote>
    <p>This requires the --spread-collections experiment to be enabled</p>
  </blockquote>
  
  <pre><code>ListView(children: [...listTiles, MyWidget()])
  </code></pre>
  
  <p>However, I didn't find anywhere where I could specify this option.</p>
  
  <p>I couldn't even make it work on the command line. <code>flutter --spread-collections run</code> gives <code>Could not find an option named "spread-collections".</code>.</p>
  
  <pre><code>flutter --version
  Flutter 1.3.8 • channel beta • https://github.com/flutter/flutter.git
  Framework • revision e5b1ed7a7f (4 weeks ago) • 2019-03-06 14:23:37 -0800
  Engine • revision f4951df193
  Tools • Dart 2.2.1 (build 2.2.1-dev.0.0 571ea80e11)
  </code></pre>