lace modules in their own file. [FIXME: needs RFC]</a></h3>
<blockquote>
<p><strong>[FIXME]</strong>
- &quot;&lt;100 lines&quot; is arbitrary, but it&#39;s a clearer recommendation
  than &quot;~1 page&quot; or similar suggestions that vary by screen size, etc.</p>
</blockquote>

<p>For all except very short modules (&lt;100 lines) and <a href="../testing/README.html">tests</a>,
place the module <code>foo</code> in a separate file, as in:</p>

<span class='rusttest'>fn main() {
    pub mod foo;

// in foo.r