I looked at this, and this failure appears to have been there since the lexical subs feature was added in 5.18
--
Karl Williamson
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via perlbug: queue: perl5 status: new
https://rt.perl.org/Ticket/Display.html?id=133885
[perl #133885] Assertion failure in S_regmatch (regexec.c:7279)
by Karl Williamson via RT