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<h1 id="lhs-test">lhs test</h1>
<p><code>unsplit</code> is an arrow that takes a pair of values and combines them to
return a single value:</p>
<div class="sourceCode"><pre class="sourceCode literate literatehaskell"><code class="sourceCode literatehaskell"><span class="ot">> unsplit ::</span> (<span class="dt">Arrow</span> a) <span class="ot">=></span> (b <span class="ot">-></span> c <span class="ot">-></span> d) <span class="ot">-></span> a (b, c) d
<span class="ot">></span> unsplit <span class="fu">=</span> arr <span class="fu">.</span> uncurry
<span class="ot">></span> <span class="co">-- arr (\op (x,y) -> x `op` y)</span></code></pre></div>
<p><code>(***)</code> combines two arrows into a new arrow by running the two arrows on a
pair of values (one arrow on the first item of the pair and one arrow on the
second item of the pair).</p>
<pre><code>f *** g = first f >>> second g</code></pre>
<p>Block quote:</p>
<blockquote>
<p>foo bar</p>
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