pan class="special">&gt;&gt;</span> <span class="char">':'</span> <span class="special">&gt;&gt;</span> <span class="identifier">int_</span><span class="special">]</span> <span class="special">|</span> <span class="identifier">int_</span> <span class="special">&gt;&gt;</span> <span class="identifier">attr</span><span class="special">(</span><span class="number">0</span><span class="special">),</span> <span class="identifier">v</span><span class="special">);</span>
<span class="identifier">std</span><span cl