The failing test was introduced by perl #116322.
commit 62ba9123033beb0f19ee9d28c9d1cc6b3bf57e46
Author: Karl Williamson <pub...@khwilliamson.com>
Date: Sun Feb 17 14:59:39 2013 -0700
Tests for [perl #116322]
commit 10e621bc35cb48b15b69b5a57242ff004f7455dc
Author: Christian Hansen <chan...@cpan.org>
Date: Sun Feb 17 14:50:30 2013 -0700
PATCH: [perl #116322]: getc() and ungetc() with unicode failure
ungetc() had no knowledge of UTF-8. This patch adds it.
The committer fleshed out the author's code to make a patch, making
a few small changes.
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via perlbug: queue: perl5 status: new
https://rt.perl.org/Ticket/Display.html?id=125723