<p>Confirmed, note that the <code>$M</code> is highlighted because it is <em>syntax</em> not because the name is known, you can remove the <code>use M</code> and it still highlights.</p>
<p>I don't know Perl much, and its possible that <code>$M::anything</code> is the appropriate syntax to highlight, but it won't depend on the package contents.  The syntax highlighting is supplied by the Scintilla lexer Geany uses, which is a separate project <a href="www.scintilla.org">here</a>.  You may wish to post a feature request there since you can then discuss it with the Perl lexer maintainer directly.</p>

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