ss="spec-doc"><p>remove and return the prefix and the last access of the expression if it's a base; otherwise return None</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-append"><a href="#val-append" class="anchor"></a><code><span><span class="keyword">val</span> append : 
  <span><span class="label">onto</span>:<a href="../index.html#type-access_expression">access_expression</a> <span class="arrow">&#45;&gt;</span></span>
  <span><a href="../index.html#type-access_expression"