erence.html#ffi-attributes">repr attribute</a> can be applied to such <code>enum</code>s to give them the same
representation as a primitive. This allows using Rust <code>enum</code>s in FFI where C
<code>enum</code>s are also used, for most use cases. The attribute can also be applied
to <code>struct</code>s to get the same layout as a C struct would.</p>

<h2 id='there-is-no-gc' class='section-header'><a href='#there-is-no-gc'>1.2 There is no GC</a></h2>
<p>A language that requires a GC is a language that