already been written.</p>
<p>Must be called on an <a href="../types/rbobject13.html?swift"><code>RbObject</code></a> for a class, or <a href="../types/rbgateway1.html?swift"><code>RbGateway</code></a>.  <strong>Note</strong> this
is different from Ruby as-written where you write <code>@@fred</code> in an object
context to get a CVar on the object’s class.</p>
<p>The behavior of accessing a non-existent CVar is not consistent with IVars
or GVars.  This is how Ruby works; one more reason to avoid CVars.</p>