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Re: ruler support in hexl mode

From: Richard Stallman
Subject: Re: ruler support in hexl mode
Date: Fri, 19 Mar 2004 23:48:23 -0500

    but the problem is, how to make the byte-compiler warn when using an
    obsolete face? AFAICS, face names are just symbols, so other uses of the
    symbol would trigger the warning too.

That is indeed the hard part.  Perhaps one could make a list of
functions that faces are commonly specified to, and check for use
of an obsolete face name quoted as an argument.
For instance, (overlay-put ... 'face 'OBSOLETE-FACE-NAME)
would trigger the warning.

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