AL__POS__"><span class="keyword">val</span> __POS__</span> : <code class="type">string * int * int * int</code></pre><div class="info ">
<code class="code">__POS__</code> returns a tuple <code class="code">(file,lnum,cnum,enum)</code>, corresponding
    to the location at which this expression appears in the file
    currently being parsed by the compiler. <code class="code">file</code> is the current
    filename, <code class="code">lnum</code> the line number, <code class="code">cnum</code> the character 