throw <a href="../types/rberror.html?swift"><code>RbError</code></a>s if anything goes wrong including
when Ruby raises an exception.  Use the <a href="../types/rbobjectaccess1.html?swift#failable"><code>RbObjectAccess.failable</code></a> adapter to
access an alternative API that returns <code>nil</code> on errors instead.  You can still
see any Ruby exceptions via <a href="../types/rberror.html?swift#history1"><code>RbError.history</code></a>.</p>
<h2 class="j2-anchor j2-heading heading" id="calling-method