title: Using the slash character in Git branch name
body: <p>I'm pretty sure I saw somewhere in a popular Git project the branches had a pattern like "feature/xyz".</p>
  
  <p>However when I try to create a branch with the slash character, I get an error:</p>
  
  <pre><code>$ git branch labs/feature
  error: unable to resolve reference refs/heads/labs/feature: Not a directory
  fatal: Failed to lock ref for update: Not a directory
  </code></pre>
  
  <p>Same problem for (my initial attempt):</p>
  
  <pre><code>$ git checkout -b labs/feature
  </code></pre>
  
  <p>How does one create a branch in Git with the slash character?</p>