title: How to provide standard library sources for IntelliJ IDEA's Rust project?
body: <p>I am using Mac for development. I installed Rust 1.13.0 using <code>brew install rust</code> and the Rust plugin 0.1.0.1385 for IntelliJ IDEA. I created my first test project with <code>cargo</code> and while opening it with IDEA I got the message</p>
  
  <blockquote>
    <p>No standard library sources found, some code insight will not work</p>
  </blockquote>
  
  <p>I haven't found any sources installed, nor the Rust sources package in Homebrew.</p>
  
  <p>How do I provide sources for the project and what are the practical implication if I ignore this step?</p>