title: Is there a way I can access a macro from a dependency's dependency without explicitly including it?
body: <p>Reqwest is built on top of Hyper which includes a <code>header!</code> macro to create custom headers. Is there a way I can access the <code>header!</code> macro without explicitly including Hyper as a separate crate? </p>
  
  <pre><code>#[macro_use] extern crate reqwest;
  
  header! { (XRequestGuid, "X-Request-Guid") =&gt; [String] }
  </code></pre>
  
  <blockquote>
    <p>cannot find macro <code>header!</code> in this scope</p>
  </blockquote>