'id identifier rubyid_is_nullable'>is_nullable</span> <span class='op'>&amp;&amp;</span> <span class='op'>!</span><span class='id identifier rubyid_instance_variable_defined?'>instance_variable_defined?</span><span class='lparen'>(</span><span class='symbol'>:&quot;@</span><span class='embexpr_beg'>#{</span><span class='id identifier rubyid_attr'>attr</span><span class='embexpr_end'>}</span><span class='tstring_end'>&quot;</span></span><span class='rparen'>)</span><span class='rparen'>)</span>
    <span cla