"keyword">namespace</span> <span class="identifier">data</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">monomorphic</span> <span class="special">{</span>
  <span class="comment">// registering fibonacci_dataset as a proper dataset</span>
  <span class="keyword">template</span> <span class="special">&lt;&gt;</span>
  <span class="keyword">struct</span> <span class="identifier">is_dataset</span><span class="special">&lt;</span><span class="identifier">fib