title: How do cells work in Buck?
body: <p>I understand that there is an <a href="https://stackoverflow.com/a/41810968/1256041">undocumented feature</a> in <a href="/questions/tagged/buck" class="post-tag" title="show questions tagged &#39;buck&#39;" rel="tag">buck</a> called cells. There are <a href="https://github.com/facebook/buck/tree/master/test/com/facebook/buck/crosscell/testdata" rel="nofollow noreferrer">some tests</a> that demonstrate how they work, but is there any more written information about them? </p>
  
  <p>How do cells work in Buck?</p>