     (which can be written as <code class="computeroutput"><span class="identifier">char_</span><span class="special">(</span><span class="string">"a"</span><span class="special">)</span></code> as well). Please note that the mixed
            syntax forms, i.e. <code class="computeroutput"><span class="identifier">char_</span><span class="special">(</span><span class="char">'a'</span><span class="special">,</span>
            <span class="string">"z"</span><span class="special">)</span></code>
            