[perl #62530] Assinging a $/ to a scalar and then accessing its extened .keys method produces a "Null PMC" error

[Eric Hodges]

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class Match is also { method keys () {return %(self).keys }; };
rule a {H};
say "Hello" ~~ /<a>/;
say $/.keys.perl;
my $x = $/; $x.keys.perl.say;

Produces:
H
["a"]
Null PMC access in find_method()