class="docutils literal notranslate"><span class="pre">File</span></code>, or an element <code class="docutils literal notranslate"><span class="pre">File</span></code> of the <code class="docutils literal notranslate"><span class="pre">Files</span></code> list, is neither a variable nor a source file name:</div>
<div class="line-block">
<div class="line"><code class="docutils literal notranslate"><span class="pre">type_error(source_file_name,</span> <span class="pre">File)</span></code></div>
</div>
<div c