by the
    compiler, with the standard error format of OCaml: "File %S, line
    %d, characters %d-%d".<br>
<b>Since</b> 4.02.0<br>
</div>

<pre><span id="VAL__LINE_OF__"><span class="keyword">val</span> __LINE_OF__</span> : <code class="type">'a -&gt; int * 'a</code></pre><div class="info ">
<code class="code">__LINE__ expr</code> returns a pair <code class="code">(line, expr)</code>, where <code class="code">line</code> is the
    line number at which the expression <code class="code">expr</code> appears 