If limited to keybindings of the form \C-c &lt;letter&gt;, at least the<br>following GNU Emacs standard packages seem to be affected (as of 2010/1/12):<br><br>1. delphi-mode (progmodes/delphi.el)<br>        &quot;\C-cu&quot; &#39;delphi-find-unit<br>
<br>2. semantic-grammar-mode (cedet/semantic/grammar.el)<br>    &quot;\C-cm&quot; &#39;semantic-grammar-find-macro-expander<br><br>3. modula-2-mode (progmodes/modula2.el)<br>    A lot. E.g.,<br>    &quot;\C-cb&quot; &#39;m2-begin<br>
    &quot;\C-cc&quot; &#39;m2-case<br><br>I didn&#39;t check packages that are not included in GNU Emacs.<br><br><br><div class="gmail_quote">On Mon, Jan 18, 2010 at 3:56 AM, Richard Stallman <span dir="ltr">&lt;<a href="mailto:rms@gnu.org">rms@gnu.org</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">    C-c prefix is supposed to be &quot;reserved&quot; for end-users.<br>
    But the sad reality is that more than several major-modes<br>
    break the convention by overriding C-c ... .<br>
<br>
</div>We need to fix those modes.<br>
Can you say which modes they are?<br>
</blockquote></div><br>