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<!-- Generator: GNU source-highlight 
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>This is a test
of Haskel literate programming;
Bird style

<span style="font-weight: bold"><span style="background-color: #33FF33">&gt;</span></span> fact <span style="color: #990000">::</span> <span style="color: #009900">Integer</span> <span style="color: #990000">-&gt;</span> <span style="color: #009900">Integer</span>
<span style="font-weight: bold"><span style="background-color: #33FF33">&gt;</span></span> fact <span style="color: #993399">0</span> <span style="color: #990000">=</span> <span style="color: #993399">1</span>
<span style="font-weight: bold"><span style="background-color: #33FF33">&gt;</span></span> fact n <span style="color: #990000">=</span> n <span style="color: #990000">*</span> fact <span style="color: #990000">(</span>n<span style="color: #990000">-</span><span style="color: #993399">1</span><span style="color: #990000">)</span>

while this is not considered code
fact :: Integer -&gt; Integer

This is the Latex style

<span style="font-weight: bold"><span style="background-color: #33FF33">\begin{code}</span></span>
tsort <span style="color: #990000">[]</span>     <span style="color: #990000">=</span> <span style="color: #990000">[]</span>
tsort <span style="color: #990000">(</span>x<span style="color: #990000">:</span>xs<span style="color: #990000">)</span> <span style="color: #990000">=</span> tsort <span style="color: #990000">[</span>y <span style="color: #990000">|</span> y<span style="color: #990000">&lt;-</span>xs<span style="color: #990000">,</span> y<span style="color: #990000">&gt;</span>x<span style="color: #990000">]</span> <span style="color: #990000">++</span> <span style="color: #990000">[</span>x<span style="color: #990000">]</span> <span style="color: #990000">++</span> tsort <span style="color: #990000">[</span>y <span style="color: #990000">|</span> y<span style="color: #990000">&lt;-</span>xs<span style="color: #990000">,</span> y<span style="color: #990000">&lt;=</span>x<span style="color: #990000">]</span>
<span style="font-weight: bold"><span style="background-color: #33FF33">\end{code}</span></span>

and the code will be formatted as you requested.
</tt></pre>