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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Foreground color opacity
Date: Mon, 11 Sep 2023 19:56:54 +0300
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To: Filippo Argiolas <filippo.argiolas@gmail.com>
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 (message from Filippo Argiolas on Mon, 11 Sep 2023 18:25:50 +0200)
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> From: Filippo Argiolas <filippo.argiolas@gmail.com>
> Date: Mon, 11 Sep 2023 18:25:50 +0200
> Cc: emacs-devel@gnu.org
> 
> Didn't encounter any issue so far with c and c-ts modes but something
> like you described could definitely happen if someone relies on font
> face to detect symbol type. I'd say that's kind of an unsafe aspect to
> rely on. Do you have any example in mind of code doing that so I could
> run some tests?

One such example is flyspell.el's flyspell-prog-mode.  See
flyspell-prog-text-faces there.