[perl #67234] [BUG] smartmatching undef against a regular expression breaks in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> jnthn: hello. I've been coding a lot since I left last night.
<masak> have a few new bugs to report.
<masak> rakudo: undef ~~ /foo/
<p6eval> rakudo 6a4d66: OUTPUT«Object must be created by a class.␤in
regex PGE::Grammar::_block50 [...]
<masak> I consider this a rakudobug.
<jnthn> Hmm, that's quite a wtf one.
<jnthn> rakudo: my $a = undef; $a ~~ /foo/
<p6eval> rakudo 6a4d66: OUTPUT«Use of uninitialized value␤»
* masak submits it
<jnthn> rakudo: my $a = undef; say $a.PARROT; say undef.PARROT;
<p6eval> rakudo 6a4d66: OUTPUT«Failure␤Failure␤»