="w">    </span><span class="kt">real</span><span class="p">(</span><span class="n">real64</span><span class="p">)</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">f</span><span class="p">(</span><span class="nb">lbound</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="mi">1</span><span class="p">):</span><span class="nb">ubound</span><span class="p">(</span><span class="n">x</span><span class="p">,</span><span class="mi