devdocs/elisp/backward-compatibility.html


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 <h3 class="section">Backward Compatibility</h3> <p>Code compiled with older versions of <code>cl-defstruct</code> that doesn’t use records may run into problems when used in a new Emacs. To alleviate this, Emacs detects when an old <code>cl-defstruct</code> is used, and enables a mode in which <code>type-of</code> handles old struct objects as if they were records. </p> <dl> <dt id="cl-old-struct-compat-mode">Function: <strong>cl-old-struct-compat-mode</strong> <em>arg</em>
</dt> <dd><p>If <var>arg</var> is positive, enable backward compatibility with old-style structs. </p></dd>
</dl><div class="_attribution">
  <p class="_attribution-p">
    Copyright &copy; 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
    <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Backward-Compatibility.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Backward-Compatibility.html</a>
  </p>
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