Fixed by commit
31f05a37c4e9c37a7263491f2fc0237d836e1a80
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Karl Williamson
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via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=56820
[perl #56820] use locale;" breaks \w on matching c-cedilla, o-diaeresis and u-diaeresis under tr_TR.utf8 and de_DE.utf8 locales
by Karl Williamson via RT