 of the assignment expression.
      </p>
<p>
        The actual return type of fusion's intrinsic sequence access (meta-)functions
        when in invoked with (an instance of) <code class="computeroutput"><span class="identifier">type_name</span></code>
        is a proxy type. This type is implicitly convertible to the attribute type
        via <code class="literal">get_expr<span class="emphasis"><em>N</em></span></code> and forwards assignment
        to the underlying element via <code class="literal"