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in reply to Re: Upgrade to 5.18 causes uninitialized ${^MATCH}
in thread Upgrade to 5.18 causes uninitialized ${^MATCH}

It appears to depend on qr.
my $pat = qr/a/p; 'aaaa' =~ /$pat/g or die; print "MATCH=[${^MATCH}]\n";
Appears to work OK on 5.18.0.