ool</span></code></div><div class="spec-doc"><p>Check if the field is the synthetic this$n of a nested class, used to access the n-th outer instance.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-to_string"><a href="#val-to_string" class="anchor"></a><code><span><span class="keyword">val</span> to_string : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> string</span></code></div><div class="spec-doc"><p>Convert a field name to a string.</p></div></d