perl -e 'qq{@{sub{]]}}}}*shift' triggers this crash in v5.25.6 (v5.25.5-104-gaff2be5).
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via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=125351
[perl #125351] null ptr deref -> Perl_ck_shift (op.c:10857)
by Brian Carpenter via RT