returns a list of what list files are currently
being processed, in order.  So if one listfile does an
<span class="target" id="index-0-command:include"></span><a class="reference internal" href="../command/include.html#command:include" title="include"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">include()</span></code></a> command then that is effectively pushing the
included listfile onto the stack.</p>
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