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tab-width ignored in .dir-locals.el

From: Grant Edwards
Subject: tab-width ignored in .dir-locals.el
Date: Fri, 12 Nov 2021 17:56:17 -0000 (UTC)
User-agent: slrn/1.0.3 (Linux)

How do you set the tab width for C-mode in a .dir-locals.el file?

All the documentation I can find says this should work:

((nil . ((indent-tabs-mode . t)
         (tab-width . 4)
 (c-mode . ((c-file-style . "BSD")
            (subdirs . t)

But when I edit a .c file, the tab width is always 8.

What am I doing wrong?

I tried adding (subdirs . t) to the first list, but that made no difference.

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