>:</span> <span class="kt">Signal</span><span class="o">&lt;</span><span class="kt">Element</span><span class="p">,</span> <span class="kt">ErrorType</span><span class="o">&gt;.</span><span class="kt">Observer</span><span class="p">,</span> <span class="nv">output</span><span class="p">:</span> <span class="kt">Signal</span><span class="o">&lt;</span><span class="kt">Element</span><span class="p">,</span> <span class="kt">ErrorType</span><span class="o">&gt;</span><span class="p">)</span></code></pre>

    