><span class="keyword">val</span> (&lt;:&gt;) : <a href="../Magma/index.html#type-t">Magma.t</a> <span>&#45;&gt;</span> <a href="../Magma/index.html#type-t">Magma.t</a> <span>&#45;&gt;</span> <a href="../Magma/index.html#type-t">Magma.t</a></code></dt></dl></details></div></div></div><div><div class="spec include"><div class="doc"><details open="open"><summary><span class="def"><code><span class="keyword">include</span> <span class="keyword">sig</span> ... <span class="keyword">end</span></code></span></sum